10 Best Mushroom Compost Mulches for a Thriving Garden in 2026

For a thriving garden in 2026, consider using Brut Organic Aspen Mulch (10 quarts), Back to the Roots Organic Premium Mulch (25.7 quarts), and Premium 100% Natural Wheat Straw for its eco-friendliness. Additionally, Brut Cow Compost (10 quarts) enhances nutrient content, while Coco Mushroom Substrate (5 lbs) supports mushroom growth. Jobe’s Organics Fertilizer (4 lbs) acts as a great starter. Each option contributes to soil health, moisture retention, and weed control, improving your garden’s overall conditions. You’ll discover more about effective mulch choices shortly.

Key Takeaways

• Coco Mushroom Substrate with Added Cow Manure offers a nutrient blend ideal for mushroom growth and can enhance soil quality for gardening.
• Cow Compost is nutrient-rich, making it a valuable organic amendment for improving soil health and supporting diverse plant types.
• Brut Organic Aspen Mulch is versatile and acts as a natural weed barrier while retaining moisture and enriching the soil.
• Back to the Roots Organic Premium Mulch is peat-free and contains moisture control agents, promoting eco-friendly gardening practices.
• Premium 100% Natural Wheat Straw serves multiple purposes, including bedding, mulch, and compost, benefiting both garden and mushroom cultivation.

Brut Organic Aspen Mulch – 10 Quarts for Landscaping and Garden Beds

Brut Organic Aspen Mulch 10 QT – Natural Moisture Retainer & Root Protector – Odor-Free...

• NATURAL GARDEN COVER: Creates a clean, polished garden surface while helping minimize weed growth naturally. This organic mulch also supports healthy soil structure and...
• HIGH CARBON ORGANIC MULCH: Formulated with 30% natural carbon to foster beneficial soil microbes and promote overall soil vitality. Ideal for garden beds, potted plants...
• MOISTURE-RETAINING & WATER-EFFICIENT: Naturally helps retain soil moisture, reducing the frequency of watering and supporting healthy root hydration. A smart...

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Brut Organic Aspen Mulch, packaged in a convenient 10-quart bag, is an excellent choice for gardeners aiming to improve soil health while protecting their plants. This nutrient-rich bark mulch retains moisture effectively, reducing how often you need to water both indoor and outdoor plants. It serves as a natural weed barrier, preventing competition for essential water and nutrients. With 30% carbon content, it fosters beneficial soil microbes, promoting overall soil health. Lightweight at only 12 pounds, it’s easy to apply as a top dressing. Plus, it’s OMRI listed, ensuring it’s a truly organic, eco-friendly option for your gardening needs.

Best For: Gardeners looking for an eco-friendly mulch that enhances soil health and moisture retention while controlling weeds.

Pros:

• Naturally prevents weeds, reducing competition for water and nutrients.
• High moisture retention helps decrease the need for frequent watering.
• OMRI listed, ensuring it’s a truly organic and child and pet-friendly option.

Cons:

• Limited to a 10-quart size, which may not be sufficient for larger projects.
• As a lightweight material, it may require occasional replenishing after heavy rains or wind.
• Some users may prefer a different texture or color for aesthetic purposes in their landscaping.

Premium 100% Natural Straw for Animal Bedding and Garden Mulch

Double F Farms Premium 100% Natural Straw for Animal Bedding, Garden Mulch, Compost & Fertilizer...

• Premium 100% All Natural Wheat Straw
• Ideal for out-door pet bedding, chicken coop, small animals, etc
• Ideal for garden mulch. Adds additional bio mass and helps reduce weeds.

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For those seeking a reliable solution for both animal bedding and garden mulch, Premium 100% Natural Wheat Straw is an excellent choice. Available in convenient 1 lb packages, this straw works well for outdoor pet bedding, including chicken coops and smaller animals. Additionally, it provides effective garden mulch, reducing weeds while adding valuable biomass to the soil. You can also use this straw for mushroom cultivation, promoting ideal growth conditions. Finally, it serves as a suitable material for compost and fertilizer, enriching your garden while supporting an eco-friendly approach. Consider incorporating this versatile product into your home and garden routine.

Best For: This product is best for pet owners, gardeners, and mushroom cultivators looking for a natural and versatile bedding and mulch solution.

Pros:

• Eco-friendly: Made from 100% natural wheat straw, making it a sustainable choice.
• Multi-purpose: Suitable for use in animal bedding, garden mulch, mushroom cultivation, compost, and fertilizer.
• Weed reduction: Effectively reduces weed growth while enriching the soil with biomass.

Cons:

• Limited packaging size: Only available in 1 lb packages, which may not be sufficient for larger needs.
• Potential for pests: Usage in animal bedding might attract pests if not properly managed.
• Dust accumulation: Some users may find it creates dust, which could be a concern for allergies or respiratory issues.

Brut Cow Compost – Organic Soil Amendment (10 Quart)

Brut Cow Compost – Nutrient-Rich Composted Cow Manure Organic Soil Amendment – 100% Pure...

• NUTRIENT-RICH GROWTH: Premium cow manure compost packed with nitrogen, calcium, and iron. This organic compost fertilizer enriches soil, boosts microbial life, and...
• PURE COMPOSTED COW MANURE: Made only from thoroughly composted cow manure, carefully aerated and tested for safety. No additives, just pure organic manure for plants...
• NO ODOR, NO BURNS: Brut is odor-free and safe for all plants. Gentle on roots, eliminating the risk of plant burn. A trusted compost for plants, seedlings, houseplants...

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Looking for a reliable organic soil amendment? Brut Cow Compost, a 10-quart container, is designed for various gardening uses, including vegetables, flowers, and lawns. Made from 100% pure, additive-free composted cow manure, it’s rich in nitrogen, calcium, and iron. This nutrient profile enhances soil structure and microbial life, promoting vibrant plant growth. It’s safe for all plants, so you won’t have to worry about root burn. Additionally, its finely sifted texture improves application ease for both indoor and outdoor gardening. With its OMRI certification, you can trust it meets organic standards. Use it as a top dressing or mix it into garden beds.

Best For: Gardeners looking for an organic, nutrient-rich soil amendment suitable for various plants and gardening applications.

Pros:

• Nutrient-rich: Contains high levels of nitrogen, calcium, and iron for enhanced plant growth.
• Safe for all plants: Odor-free and eliminates the risk of root burn.
• Versatile application: Can be used as a top dressing, mixed into garden beds, or as an enrich-er for potted plants.

Cons:

• Limited to cow manure: May not provide the diversity of nutrients found in other composts.
• Availability: Depending on location, may not be readily available at local garden centers.
• Storage space: The 10-quart size might not be sufficient for larger gardening projects.

5 LBS Black Coco Mushroom Substrate

SGM LABS 5 LBS Black Coco Mushroom Substrate

• HIGH YIELD SUBSTRATE: Coco Coir, Vermiculite, and Gypsum (CVG) mix is fortified with all the nutrients your mycelium needs to mature from spore to fruiting mushrooms.
• EASY TO USE: We take the guess work out of mushroom growing. This substrate is perfect whether you're a first-time grower, a hobbyist, or a bulk large-scale cultivator...
• 5 LB CVG SUBSTRATE 0.2 MICRON BAG PRE HYDRATED

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The 5 LBS Black Coco Mushroom Substrate offers an excellent option for both beginners and experienced growers aiming for a productive mushroom garden. This substrate is a blend of high-quality coco coir, vermiculite, and gypsum, designed for ideal mycelium development from the spore stage to fruiting. It’s pre-hydrated and ready to use right out of the bag, which simplifies the process for first-time growers. You can use it as casing, fill a monotub, or utilize it in a grain bag. With its 0.2 micron bag size, you can trust this substrate for a clean and efficient growing experience.

Best For: This product is best for first-time growers, hobbyists, and large-scale cultivators seeking an easy and effective mushroom growing solution.

Pros:

• Pre-hydrated and ready to use, eliminating the guesswork for beginners.
• Fortified with essential nutrients to support high yield growth.
• Versatile application options including casing, monotubs, and grain bags.

Cons:

• Limited to specific types of mushrooms that thrive in this substrate mix.
• May require additional amendments for specialized mushroom strains.
• The 5 lbs weight may not be sufficient for larger operations needing more substrate.

Back to the Roots 25.7qt (1 Cubic ft) Organic Premium Mulch

Back to the Roots 25.7qt (1 Cubic ft) Organic Premium Mulch

• 100% Organic & Peat-Free: Our organix mulch mix is 100% organic & peat-free. Peat is one of Mother Nature’s most important stores of carbon. Instead of imported peat...
• Intended for use in Mulch Soil: Our unique soil blend is ideal for nurturing herbs, vegetables, and fruits planted in a raised bed. Its nutrient-rich composition provides...
• Better Moisture Control and Water Absorption: Our unique soil blend incorporates yucca extract for moisture control, dolomitic limestone for pH balancing, and gypsum for...

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Back to the Roots 25.7qt (1 Cubic ft) Organic Premium Mulch stands out as an ideal choice for gardeners seeking a quality solution that nurtures a variety of plants. This 100% organic, peat-free mulch mix uses upcycled plant matter and wood fines from the U.S. It effectively supports herbs, vegetables, fruits, and flowers in pots, raised beds, or in-ground setups. Each bag contains all-purpose plant food, dolomitic limestone for pH adjustment, and yucca extract for enhanced moisture control. With a weight of 20 pounds and rated 4.4 out of 5 stars, it offers a reliable foundation for your garden’s growth.

Best For: Gardeners looking for an organic, nutrient-rich mulch solution to enhance the growth of herbs, vegetables, fruits, and flowers in various gardening setups.

Pros:

• 100% organic and peat-free, promoting environmentally-friendly gardening practices.
• Contains essential nutrients and moisture control agents for robust plant growth.
• Satisfies customer needs with a satisfaction guarantee and an educational initiative for schools.

Cons:

• Weighs 20 pounds, which may be cumbersome for some users to handle and transport.
• Potentially limited availability depending on location and season.
• Some users might prefer specific mulch types based on their gardening style or plants.

10 LBS Coco Mushroom Substrate with Added Cow Manure (1 Bag)

10 LBS Coco Mushroom Substrate with Added Cow Manure (1 Bag)

• HIGH YIELD SUBSTRATE: Coco Coir, Cow Manure, Vermiculite, and Gypsum (CVG) mix is fortified with all the nutrients your mycelium needs to mature from spore to fruiting...
• EASY TO USE: We take the guess work out of mushroom growing. This substrate is perfect whether you're a first-time grower, a hobbyist, or a bulk large-scale cultivator...
• 10 LB CVG with COW MaNURE SUBSTRATE 0.2 MICRON BAG PRE HYDRATED

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Coco Mushroom Substrate with Added Cow Manure offers an excellent solution for both novice and experienced mushroom cultivators. This 10-pound bag features a blend of coco coir, cow manure, vermiculite, and gypsum, providing essential nutrients for mycelium growth. It’s ready to use right out of the bag, helping you start immediately. You can fill monotubs, use it as casing, or grow directly in the bag. Its versatility makes it perfect for hobbyists and large-scale cultivators alike. The tried and tested formula guarantees peak mushroom growth throughout the entire maturation process, from spore to fruiting mushrooms.

Best For: First-time growers, hobbyist cultivators, and large-scale mushroom farming operations.

Pros:

• High-quality blend of coco coir, cow manure, vermiculite, and gypsum promotes optimal mycelium growth.
• Pre-hydrated and ready to use, simplifying the preparation process for growers.
• Versatile application allows for filling monotubs, use as casing, or direct growth in the bag.

Cons:

• The nutrient profile might not cater to specific mushroom varieties that require tailored substrates.
• Depending on local climate conditions, additional moisture management may be needed for best results.
• Limited to a 10-pound bag, which may require purchasing multiple bags for larger cultivation projects.

Michigan Peat Compost and Manure Blend, Garden Magic Mix (40 Lbs)

Michigan Peat Compost and Manure Blend, Garden Magic Mix with Odor-Free Blend, 40 Lbs - Outdoor Lawn...

• Organic Compost Blend: Enhance the nutrient content and soil quality of lawns and raised garden beds with this organic blend, promoting healthy plant growth and soil...
• Ready-to-Use Mixture: Pre-prepared with odorless organic reed sedge peat and composted animal manure, this blend is ready to use immediately for all your gardening needs
• Essential Nutrients for Plant Growth: Packed with vital nutrients, this blend supports the healthy growth of flowers, vegetables, and grass, ensuring strong, vibrant...

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When you’re looking to enrich your garden soil effectively, Michigan Peat Compost and Manure Blend, Garden Magic Mix (40 lbs) stands out as a solid choice. This organic blend consists of odorless reed sedge peat and composted animal manure, providing essential nutrients for flowers, vegetables, and grass. It’s ready to use, making it convenient for enhancing soil quality in lawns, raised garden beds, and potting mixes. Each 40-pound bag covers approximately 0.75 cubic feet, which is suitable for small-scale gardening projects. By incorporating this mix, you can improve soil structure and boost plant growth in your garden effectively.

Best For: Gardeners looking to improve soil quality and boost plant growth in small-scale gardening projects.

Pros:

• Organic composition promotes healthy plant growth.
• Ready-to-use formula simplifies the gardening process.
• Covers approximately 0.75 cubic feet, perfect for smaller areas.

Cons:

• May not be sufficient for larger gardening projects.
• The coverage may require multiple bags for extensive areas.
• Some users might prefer alternative soil amendments for specific plants.

Jobe’s Organics Fast Acting Granular Fertilizer Compost Starter (4 lbs Bag)

Jobe's Organics Fast Acting Granular Fertilizer Compost Starter, Easy Plant Care Compost...

• Organic compost starter speeds up the composting process and is ideal for outdoor compost piles
• Compost accelerator is formulated with a 4-4-2 NPK to provide vegetables, plants, and flowers nutrients they need for a high yield and vibrant foliage
• Jobe's organic compost starter contains no synthetic chemicals and is OMRI listed for organic gardening by the USDA

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Jobe’s Organics Fast Acting Granular Fertilizer Compost Starter is an excellent choice for gardeners looking to enhance their composting efforts, especially if you’re starting an outdoor compost pile. This 4-pound bag features a balanced NPK ratio of 4-4-2, which supplies essential nutrients for your vegetables, plants, and flowers. By using this organic compost starter, you’ll accelerate the decomposition process and improve your compost’s overall quality. It’s also OMRI listed, ensuring it’s compliant with organic standards and free from synthetic chemicals. For best results, apply it every 4 to 6 weeks to maintain ideal nutrient levels in your pile.

Best For: Gardeners looking to enhance their outdoor composting efforts with an organic and effective compost starter.

Pros:

• OMRI listed for compliance with organic standards, ensuring safety for your garden.
• Balanced NPK ratio of 4-4-2 that supports the growth and health of various plants.
• User-friendly application every 4 to 6 weeks makes it easy to maintain nutrient levels.

Cons:

• Limited to outdoor compost piles, not suitable for indoor composting.
• Requires regular application, which may be an extra task for busy gardeners.
• Some users may find 4 lbs insufficient for larger composting projects.

Surfin’ Spores Premium Bulk Mushroom Substrate (5 lbs)

Surfin' Spores Premium Mushroom Substrate - 5 lbs Bulk CVG Blend for Monotub Cultivation...

• 【Expert-Crafted Quality】- Meticulously pasteurized by professional mycologists, our substrate blends premium coco coir, vermiculite, and gypsum for the ultimate...
• 【Plant-Powered Longevity】- Our eco-friendly CVG substrate surpasses manure-based alternatives in shelf- life and odorlessness, promising a pristine growing experience...
• 【Optimized for Variety】- Whether you're cultivating gourmet or medicinal varieties, our substrate is the grower's choice for producing abundant and healthy mushrooms...

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For those seeking a dependable substrate for mushroom cultivation, Surfin’ Spores Premium Bulk Mushroom Substrate offers an excellent solution. This 5-pound substrate features a blend of coco coir, vermiculite, and gypsum, designed by expert mycologists. It’s meticulously pasteurized, ensuring an odor-free experience, which is important for your growing space. With a shelf life exceeding six months, you can store it conveniently without compromising quality. Ideal for monotub setups, this substrate is versatile for growing both gourmet and medicinal mushroom varieties. Simply mix in your colonized grain for easy preparation and enjoy a hassle-free cultivation process.

Best For: This product is best for novice and experienced mushroom growers looking for a high-quality substrate that supports optimal fungal growth in monotub setups.

Pros:

• Meticulously pasteurized for a clean, odor-free cultivation environment.
• Versatile for both gourmet and medicinal mushroom varieties, catering to a wide range of growers.
• Excellent shelf life of over six months ensures convenient storage without quality loss.

Cons:

• Requires additional ingredients (colonized grain) for preparation, which may not suit all users.
• Limited to a specific setup (monotub), which may restrict growing options for some cultivators.
• May be more costly compared to homemade substrate alternatives.

R&M Organics Premium Organic Compost

R&M Organics Premium Organic Compost 10 lb Bag for Vegetables, Flowers, Plants & Lawns-All Purpose...

• Nutrient-Rich Organic Compost for Healthy Soil: Support stronger plant growth with this premium organic compost made from dairy cow manure. This all purpose soil...
• All Purpose Use for Indoor and Outdoor Gardening: Perfect for a wide range of applications including tomatoes, herbs, zucchini, citrus trees, roses, orchids, lawns and...
• Low Odor and Fully Composted for Easy Use: Processed through a complete composting method with continuous aeration to help reduce unwanted odors and impurities. The...

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R&M Organics Premium Organic Compost is an excellent choice if you’re looking to enhance your garden’s health and productivity, thanks to its all-purpose formulation derived from 100% dairy cow manure. This compost replenishes nutrients often depleted by previous harvests, making it ideal for various plants, including tomatoes, roses, and avocados. To use, apply a quarter-inch layer to existing gardens or mix in slightly more for new planting projects. The compost undergoes complete processing for low odor and guarantees constant aeration, reducing bacteria and weed seeds. Conveniently, it comes in a compact 10lb bag, enhancing moisture retention and saving you time.

Best For: Gardeners looking to improve soil health and nutrient levels for a wide variety of plants.

Pros:

• Provides essential nutrients to replenish depleted soil after harvests.
• Low odor formula makes it suitable for indoor use.
• Compact 10lb bag is easy to move and store, while enhancing moisture retention.

Cons:

• May require more frequent application for heavy feeders.
• Limited to use with dairy manure, which might not appeal to all organic gardening practices.
• The quarter-inch application may not be sufficient for all soil conditions.

Factors to Consider When Choosing Mushroom Compost Mulch

When choosing mushroom compost mulch, it’s essential to take into account factors like nutritional content and odor control properties. You’ll want to evaluate the composition and ingredient types, as they impact plant growth and soil health. Additionally, think about application versatility and environmental sustainability to guarantee you’re making a responsible choice for your garden.

Nutritional Content for Growth

Choosing the right mushroom compost mulch for your garden requires careful consideration of its nutritional content, as it plays a critical role in your plants’ growth and health. High-quality mushroom compost typically contains essential minerals like nitrogen, phosphorus, and potassium, which are crucial for healthy plant development. Additionally, many composts include organic matter that improves soil structure and enhances microbial activity, promoting an ideal growing environment. Look for substrates fortified with calcium and magnesium, as these nutrients support overall plant maturation. A nutrient-rich compost can enhance crop yield and flavor, whether you’re growing vegetables or flowers. Furthermore, it increases soil water retention, helping to reduce the frequency of irrigation needed in your garden.

Odor Control Properties

While evaluating mushroom compost for its nutritional value, you’ll also want to take into account its odor control properties. Quality mushroom compost is thoroughly composted, which helps eliminate the unpleasant smells associated with raw manure. During the creation process, proper aeration plays an essential role, encouraging beneficial microorganisms to thrive while reducing bad bacteria and odors. A well-prepared compost should maintain a low odor profile, suitable for both indoor and outdoor gardening. You should look for products that advertise their odor-free attributes, indicating high-quality ingredients and effective processing methods. A properly composted mixture delivers an earthy scent rather than a foul smell, contributing to a more pleasant gardening experience and enhancing your satisfaction.

Composition and Ingredients Types

The composition of mushroom compost mulch plays a crucial role in its effectiveness as a growing medium. Ideally, it should include organic materials such as coco coir, vermiculite, and gypsum, which enhance moisture retention and nutrient availability. Including cow manure increases the nutrient profile, providing essential nitrogen and calcium for mycelium growth.

Ensure the substrate you choose is pasteurized and free from harmful additives, which promotes healthy fungal growth and reduces contamination risks. The consistency of the mulch should balance aeration and moisture retention, preventing waterlogging while allowing adequate oxygen flow. Look for effective solutions that emit a low odor, confirming a well-maintained composting process that limits bad bacteria and potential weed seeds in your garden.

Application Versatility and Ease

Mushroom compost mulch offers numerous applications in your gardening endeavors, making it a versatile choice for various landscapes. You can enhance soil quality, use it as a growing medium for mushrooms, or create a solid base layer for raised garden beds. Many products come pre-hydrated and ready to use, simplifying your preparation process. Specific blends, like those with vermiculite and coir, are designed for ideal versatility, allowing for applications in monotubs or direct planting setups. The nutrient profile supports diverse plants and fungi, promoting robust growth. Typically, mushroom compost enhances moisture retention, reducing your watering frequency, which benefits both indoor and outdoor gardens. Consider these factors to maximize the effectiveness of your gardening efforts.

Environmental Impact and Sustainability

When selecting mushroom compost mulch, it’s essential to take into account its environmental impact and sustainability. Opt for products made from sustainable materials, as they often use byproducts from agriculture, reducing waste. Many mushroom composts, especially those with coco coir and natural fertilizers, are biodegradable, promoting soil health and enhancing microbial activity. By using organic mushroom compost, you can decrease reliance on synthetic fertilizers, helping to lower your carbon footprint. Moreover, production processes recycle agricultural waste, minimizing landfill contributions and greenhouse gas emissions. Implementing eco-friendly mushroom compost fosters biodiversity, positively affecting soil quality, and being safe for various plant species. Overall, mindful choice in compost enriches your garden and supports a healthier environment.

Packaging and Storage Details

Selecting the right packaging and storage details for mushroom compost mulch can greatly influence your gardening experience. Mushroom compost mulch is typically available in sizes like 5 lbs and 10 lbs, providing options based on your needs. Most products come pre-hydrated and ready to use, which reduces your preparation time considerably. Look for packaging that includes specific instructions, especially if you’re a first-time grower. Additionally, quality assurance is often indicated, confirming that the compost was treated or pasteurized for ideal fungal health, minimizing contaminants. It’s important to check for shelf life details; many substrates have usability beyond six months, giving you flexibility for long-term gardening projects. Proper selection guarantees an effective and manageable gardening endeavor.

Frequently Asked Questions

How Do I Determine the Right Amount of Mulch for My Garden?

To determine the right amount of mulch for your garden, measure the area you want to cover. Generally, aim for a depth of 2-4 inches. For example, multiply the length by the width in feet to find the square footage. Then, calculate the cubic yards needed by dividing the total square footage by 100, as one cubic yard covers approximately 100 square feet at a 3-inch depth. Adjust as necessary based on your specific garden needs.

Can Mushroom Compost Be Used in Vegetable Gardens?

Yes, you can use mushroom compost in vegetable gardens. It’s rich in nutrients and beneficial microorganisms that help improve soil health. To apply, spread a 2-3 inch layer around your plants or mix it into the top 6-12 inches of soil. It’s important to make sure it’s well-aged, as fresh mushroom compost can be high in salts, which might harm plants. Monitor your plants’ growth, adjusting application based on their health and requirements.

Is Mushroom Compost Safe for All Plants?

Mushroom compost isn’t safe for all plants, but it can benefit many. Its well-balanced nutrients enrich soil, enhancing plant growth; however, it may not suit sensitive plants like certain herbs. Use it in moderation, mixing it with regular soil at a ratio of about 1:3. To avoid harmful salt build-up, guarantee proper drainage. Conduct a soil test first, particularly if you’re growing plants with specific needs, to tailor your soil’s composition correctly.

How Often Should I Refresh My Mulch?

You should renew your mulch every six to twelve months, depending on the type and climate conditions. If it begins to break down or loses depth—usually around two to three inches—it’s time to add more. Check for weeds or pests beneath the mulch, as these can compromise plant health. Reapplying a new layer not only maintains aesthetics but also supports moisture retention and temperature regulation in your garden. Consider a depth of one to two inches when renewing.

What Additional Amendments Can Enhance Mushroom Compost Effectiveness?

To enhance mushroom compost effectiveness, consider adding well-rotted manure, bone meal, or greensand. Well-rotted manure provides essential nutrients; use about one part manure to three parts mushroom compost. Bone meal adds phosphorus, promoting root development; mix in at the rate of 1 to 2 cups per cubic foot of compost. Greensand enriches soil with trace minerals. Incorporate these amendments evenly, ensuring thorough mixing, and allow the compost to rest for at least two weeks before application.