Amendments
Choose by project
Improving existing soil
Choose the job first: prepare an in-ground planting area, add compost or castings, or adjust a soil property. An amendment is an ingredient to use according to its directions, not automatically a complete potting mix.
Before you choose
- Read whether the product is a complete growing mix or an amendment.
- Follow the stated blending or application rate.
- Check your soil before choosing products intended to change its pH.
Good places to start
Planting directly in the ground? Coast of Maine Cobscook is a separate in-ground option; compare its directions with the amendment you are considering.
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On Sale
Coast of Maine Schoodic Blend, Organic and Natural Composted Manure Blend, 1 cu ft
Coast of Maine
Now: $7.74Was: $9.99The perfect soil for your growing garden! Key Product Features Soil-Reconditioning Compost Blend: Designed to revitalize poor soil in vegetable gardens and flower beds for healthier plant...Now: $7.74Was: $9.99 -
Espoma Organic Peat Moss Soil Amendment to Improve Heavy Soils, 8qts
Espoma
$8.99Give your plants a high-quality soil that promotes optimal growth when you mix in Organic Peat Moss from Espoma! Key Product Features Ideal for Seed Starting & Custom Mixes: Perfect for starting...$8.99 -
On Sale
Coast of Maine Quoddy Blend, Organic and Natural Compost Blend with Lobster and Crab, 1 cu ft
Coast of Maine
Now: $10.11Was: $12.99The perfect soil for your growing garden! Key Product Features Seafood Compost Soil Amendment: Ideal for use in gardens, beds, and borders to support healthy soil and thriving plants Plant Growth...Now: $10.11Was: $12.99 -
On Sale
Hydrofarm Organic Coco Coir Planting Chips, Block, 9lb, 15oz
Hydrofarm
Now: $16.48Was: $17.99Grow with confidence with these coco coir planting chips from Grow!T Key Product Features:Now: $16.48Was: $17.99 -
Espoma Organic Perlite for Improving Heavy Soils & Preventing Compaction, 8qt
Espoma
$10.99Espoma Organic Perlite Potting Mix contains all-natural, 100% Perlite to help improve heavy soils.Key Product FeaturesIdeal for Seed Starting & Custom Mixes: Perfect for seed starting or blending...$10.99 -
On Sale
Espoma Organic Soil Acidifier – Lowers Soil pH and Turns Hydrangeas Blue
Espoma
$6.98 - $29.99Lower your soil's pH to provide ideal growing conditions for berries, hydrangeas, and more with Organic Soil Acidifier from Espoma. Key Product Features Soil Acidifier: Intended for use on...$6.98 - $29.99 -
Royal Gold Coco & Perlite 70-30 Premium Soilless Growing Medium Blend, 1.76 Cu Ft
Royal Gold
$17.99Industry-leading Coco is now available in this 70-30 blend!Key Product FeaturesRinsed, buffered, processed, and packaged, this Coco-Perlite mix is ready right out of the bag for immediate use,...$17.99 -
Hoffman Horticultural Perlite — Lightweight Soil Conditioner for Drainage & Aeration
Hoffman
$9.99 - $31.44Create healthier roots and better drainage with a lightweight, natural soil conditioner trusted by gardeners. Key Product Features Natural Soil Loosener — A natural way to loosen heavy or clay...$9.99 - $31.44 -
Hoffman Horticultural Vermiculite Soil Conditioner — Lightweight Mix for Seeds & Cuttings
Hoffman
$11.99 - $38.24Create healthier roots and faster germination with a lightweight soil conditioner that improves aeration, moisture balance, and nutrient retention. Key Product Features Improves Soil Structure —...$11.99 - $38.24 -
On Sale
Espoma Organic & All Natural Charcoal, Helps Improve Drainage in Containers & Terrariums, 4qt
Espoma
Now: $7.00Was: $15.99Espoma Organic Charcoal is ideak for horticulture use.Key Product FeaturesApproved for Organic Gardening: Made from natural materials and suitable for organic gardening applications.100% Natural...Now: $7.00Was: $15.99 -
Coast of Maine Penobscot Blend Organic and Natural Planting Mix for Trees, Shrubs and Perennials, 1 cu ft
Coast of Maine
$11.99The perfect soil for your growing garden! Key Product Features All-Purpose Garden Planting Mix: Ideal for bedding annuals and planting perennials, roses, shrubs, and trees in garden...$11.99 -
Down To Earth Organic Prilled Garden Lime Calcium Carbonate Soil Amendment, 5 lbs
Down To Earth
$17.99Down to Earth’s Garden Lime raises soil pH to create a hospitable home for alkaline-loving plants!Key Product FeaturesAll-Natural Formulation: Down to Earth Garden Lime is a five-pound box of...$17.99 -
Coast of Maine Fish Bone Meal Organic Plant Food for Flowering and Root Growth, 3lb
Coast of Maine
$19.99The perfect soil for your growing garden! Key Product Features Flowering & Root Growth Plant Food: Promotes strong root development and abundant blooms for vegetables, flowers, and herbs Dehydrated...$19.99 -
Jonathan Green MAG-I-CAL PLUS Soil Food for Lawns in Acidic + Hard Soils
Jonathan Green
$28.99 - $59.99Set the stage for a thriving lawn by giving your soil the attention it deserves. Key Product Features$28.99 - $59.99 -
Organic Mechanics Pure Rice Hulls Perlite Substitute
Organic Mechanics
$9.99 - $29.99The perfect perlite substitute for weed control in your garden!Key Product Features Versatile Soil Additive – Ideal for blending into potting mixes or layering on top of soil for added...$9.99 - $29.99 -
$9.99