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Dry Amendments

132 products

Dry amendments and minerals to build and recharge living soil.

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Regular price $29.99
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GAIA GREEN Power Bloom is a high phosphate fertilizer specifically formulated to support prolific flowering and fruiting. As a result, GAIA GREEN Power Bloom is our best fertilizer for root develo...
Regular price $7.99
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One 75 g serving keeps your plant fed for an entire grow cycle. One application lasts an entire grow cycle. Programmed release NPK for both Veg and Bloom. Nitrogen and Phosphorus for leafy greens a...
Regular price $24.99
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Riverview Living Soils Pumice 0.5cf — a premium volcanic mineral amendment that dramatically improves soil drainage, aeration, and root zone structure. Pumice is a lightweight, porous rock that hol...
Regular price $5.99
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Hoffman® Pelletized Horticultural Lime - 8lb Hoffman 4# Garden Lime Pelletized is an 8lb bag of pelletized horticultural lime, perfect for reducing soil acidity in lawns, flower and vegetable garde...
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Regular price $17.70
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.TeraGanix Premium Bokashi Bran is a compost starter made from high-qual...
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Your mulch isn’t breaking down fast enough, nutrients feel “locked up,” and you want that living-soil pop without overcomplicating things? Kashi Gold is our answer: an artful, small-batch bokashi d...
Regular price $15.99
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 Down To Earth’s Feather Meal 12-0-0 is derived from hydrolyzed, dried and ground poultry feathers. An all-natural source of slow-release nitrogen, it is perfect for corn, tomatoes and fall harvest...
Regular price $11.99
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Down To Earth’s Granular Humic Acids is a highly concentrated source of humic substances that is ideal for use on fields, turf and vegetable gardens. Carefully mined from one of the world’s...
Regular price $16.99
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A byproduct of the West Coast crab harvest, Down To Earth’s Crab Meal 4-3-0 is a wonderful source of plant nutrients for vegetable gardens, flower beds and field crops. The coarse texture of DTE Cr...
Regular price $14.99
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Down To Earth's Langbeinite supplies three vital plant nutrients and is OMRI listed! The five-pound box of all-natural fertilizer has a 0-0-22 formula and is listed by the Organic Materials Review ...
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Down To Earth's Alfalfa Meal promotes accelerated growth and plant development. A four-pound box of all-natural fertilizer with a 2-0-1 ratio is listed by the Organic Materials Review Institute (OM...
Regular price $21.99
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The high nitrogen found inDown to Earth?s Blood Meal fertilizer promotes rapid vegetative growth. Down to Earth Blood Meal is a 4-pound box of all-natural blood meal with 12-0-0 formulation A readi...
Regular price $16.99
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Down to Earth's Garden Gypsum loosens clay soil. It is prilled, fast-acting, and easy to apply. Down to Earth Garden Gypsum is a five-pound box of all-natural mineral fertilizer and is listed by th...
Regular price $19.99
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Boost your garden's health with BAS Neem and Karajan Mixed 50/50 2.5# Bag. This unique blend of neem and karajan provides a 50/50 mix for maximum benefits. Improve soil quality and protect your pla...
Regular price $19.99
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The undisputed champion of organic fertilizers Bat Guano 7-3-1 is rich in readily available Nitrogen Phosphorus and Micronutrients providing essential plant nutrition for vigorous vegetative grow...
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Calcined Clay has become a popular soil amendment for all categories of...
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.PBH Rice Hulls (organic) — par-boiled rice hulls engineered as a soil a...
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Worm castings are one of a gardener’s best friends. Our source of organic high-quality worm castings can be used for nearly all growing applications from adding to your favorite potting medium wh...
Regular price $28.00
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  BuildASoil Craft Blend started with a big workshop full of the best and cleanest soil amendments available. I quickly became spoiled and would use all of the BuildASoil ingredients together and i...
Regular price $12.99
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 Down To Earth’s AZOMITE is a natural mineral product mined in central Utah. This unique deposit was formed when an ancient volcano erupted and its ash settled into a prehistoric seabed creating a ...
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Enhance your gardening game with BAS Glacial Rock Dust Gia Green 4lb. Infused with nutrient-rich minerals, this dust promotes healthy soil and plant growth. Boost your plants' vitality and yield wi...
Regular price $21.99
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BuildASoil's Favorite Mustard Seed Meal Fertilizer is approved for organic production. Our fertilizer is rich in natural plant nutrients and amino acids. Its formulation is 100% plant-derived allo...
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GAIA GREEN Greensand is mined from ancient, nutrient-rich deposits of oceanic sediment. Over time, this sediment developed into glauconite, which is highly effective as a slow-release fertilizer us...
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Kelp Meal is pure Ascophyllum nodosum seaweed from the clean, cold waters of the North Atlantic Ocean. It is hand-harvested, carefully dried, and finely milled. Our Kelp Meal provides a rich natura...
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Down to Earth's Seabird Guano 0-11-0 dramatically increases both the amount and size of blooms. Down to Earth Seabird Guano is a five-pound box of all-natural fertilizer with a 0-11-0 formula and i...
Regular price $13.99
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Hoffman Horticultural Vermiculite 8 Quart is an efficient and popular soil conditioner. Loosens soil and provides aeration. Retains water. Can be used to start seeds, propagate cuttings and store b...
Regular price $25.99
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Gaia Green All Purpose Fertilizer is an ideal blend for gardens and landscapes. Each 2kg bag provides the benefits of multiple fertilizers to promote healthy growth and vibrant blooms. With an NPK ...
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Regular price from $9.99
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Regular price $14.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Soil toppers offer a customizable finishing touch to complement all you...
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Regular price from $9.99
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Regular price $14.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Soil toppers offer a customizable finishing touch to complement all you...
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Chunky Perlite is a large and super lightweight, naturally occurring vo...
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Regular price from $9.99
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Regular price $14.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Soil toppers offer a customizable finishing touch to complement all you...
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33% Off
Regular price from $9.99
Sale price from $9.99
Regular price $14.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Soil toppers offer a customizable finishing touch to complement all you...
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Regular price $12.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Sol Biotics - Soil Salvation Think of this like adding little 5-Star ho...
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.DESCRIPTION Pumice (filtered 3/8" to 1/4" in size) is relatively lightw...
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Regular price from $29.70
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.TCM Consortium Microbes are the perfect product to create a vibrant and...
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Regular price $19.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Ridgeline Organics Nature’s Acid is a premium organic soil conditioner....
Regular price from $18.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Ridgeline Organics Carbon-Max 3-0-3 Give your plants the carbon-rich nu...
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.TerraBiome Mineral Soil Builder 5-2-4 is a professional-grade organic s...
Regular price $35.99
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.RIDGELINE ORGANICS® LAZARUS™ SOIL REJUVENATION MIX Rebuild Soil. Feed B...
Regular price $220.00
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⚠️ This item ships separately directly from our supplier partner and will arrive independently from other items in your order.Elite Starter Bundle — premium all-in-one kit that takes your plants to...
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Featured brands!

  • BuildASoil logo with The #1 Choice for Custom Organic Fertilizer tagline
  • Royal Gold logo with Rooted in Humboldt tagline
  • Gorilla Grow Tent logo with Grow Strong tagline
  • FoxFarm Soil & Fertilizer Company logo
  • Grower's Choice logo