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Worm Castings & Organic Compost

Worm castings and compost help build the soil biology and structure plants depend on. They are gentle amendments for containers, raised beds and garden soil.

Shop castings, compost blends and related organic amendments for top dressing, transplanting and rebuilding tired soil.

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How to Choose

  • Pure castings are a gentle microbe and nutrient boost.
  • Compost builds bulk soil structure.
  • Specialty composts add different organic matter and minerals.
  • Top-dress or mix into soil at planting.

Common Questions

Can worm castings burn roots?

They are generally gentle compared with concentrated fertilizers. Use product directions for best results.

Castings or compost?

Castings are concentrated; compost is the bulk soil builder. Many gardens use both.

Shop Current Products

48 visible in-stock products from the live catalog.

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CME 8qt Wiscasset Earthworm Castings — Case of 6 Coast Of Maine Organic Product CME 8qt Wiscasset Earthworm Castings — Case of 6 CMEWI4501 $25.99 Espoma 4qt Earthworm Castings Espoma Espoma 4qt Earthworm Castings ESPEC4 $12.99 Sun Gro Horticulture Black Gold Earthworm Castings 8qt Sun Gro Horticulture Sun Gro Horticulture Black Gold Earthworm Castings 8qt SUN1490302Q08P $13.99 CME 8qt Wiscassett Earthworm Castings Coast Of Maine Organic Product CME 8qt Wiscassett Earthworm Castings CMEWI4500 $22.99 COM 20qt Wiscasset Earthworm Castings Coast Of Maine Organic Product COM 20qt Wiscasset Earthworm Castings CMEWI3500 $47.99 Colorado Worm Company Premium Vermicompost Worm Castings BuildASoil Colorado Worm Company Premium Vermicompost Worm Castings COWOCO1 from $45.00 Earth Science 12 lbs Earth Worm Castings Encap Earth Science 12 lbs Earth Worm Castings ENC118964 $26.99 Earth Science 4 lbs Earth Worm Castings Encap Earth Science 4 lbs Earth Worm Castings ENC121306 $12.99 Gaia Green Organics Worm Castings Gaia Green Gaia Green Organics Worm Castings GAGWC2LP from $15.99 Greengro Premium Worm Castings Green Gro Greengro Premium Worm Castings GGBPWC4 $16.99 Htg Supply, Detroit Nutrient Company 25 lbs Vermicompost 100% Worm Castings Htg Supply Htg Supply, Detroit Nutrient Company 25 lbs Vermicompost 100% Worm Castings DNCVRM30257 $42.99 Pearl Valley Organix Healthy Grow High Quality Worm Castings Pearl Valley Organix Pearl Valley Organix Healthy Grow High Quality Worm Castings PVOHGRWC15 $38.99 Black Kow 40 lbs Organic Mushroom Compost Black (gold) Kow Black Kow 40 lbs Organic Mushroom Compost BGE226127 $14.99 #1 BuildASoil Worm Castings BuildASoil #1 BuildASoil Worm Castings WP101 from $32.00 Coast Of Maine Organic Product CME 1cf Quoddy Blend Lobster Compost Coast of Maine Coast Of Maine Organic Product CME 1cf Quoddy Blend Lobster Compost CMEQD1000 $23.99 Royal Gold 1cf Worm Castings Royal Gold Royal Gold 1cf Worm Castings RGSRGWC01P $32.99 True Organic 4 lbs Worm Castings True Organic Products True Organic 4 lbs Worm Castings TRUR0054 $10.99 Unco Industries Wiggle Worm 15 lbs Soil Builder Worm Castings Unco Industries Unco Industries Wiggle Worm 15 lbs Soil Builder Worm Castings UII603 $19.99 Unco Industries Wiggle Worm 30 lbs Soil Builder Worm Castings Unco Industries Unco Industries Wiggle Worm 30 lbs Soil Builder Worm Castings UII604 $30.99 Unco Industries Wiggle Worm 4.5 lbs Soil Builder Worm Castings Unco Industries Unco Industries Wiggle Worm 4.5 lbs Soil Builder Worm Castings UII602 $11.99 WormGanics 1cf OrganicWorm Castings Silver Bait WormGanics 1cf OrganicWorm Castings WRGWG25 $21.99 WormGanics 8qt Organic Worm Castings Silver Bait WormGanics 8qt Organic Worm Castings WRGWG8 $12.99 Espoma.75cf Mushroom Compost Espoma Espoma.75cf Mushroom Compost ESPMC75 $9.99 28×61cm Compostable Vacuum Sealer Bags 454 Bags 28×61cm Compostable Vacuum Sealer Bags 28-61CM-COMPOST-1 from $34.00 Algreen Soil Saver Classic Composter Algreen Algreen Soil Saver Classic Composter ALG01512 $171.99 AZOMITE Field Grade AZOMITE AZOMITE Field Grade AZO-FIELD-44LB $24.99 Basalt Rock Dust Flour - Good Vibes Paramagnetic Blend BuildASoil Basalt Rock Dust Flour - Good Vibes Paramagnetic Blend CLB103 from $23.99 Basalt Rock Dust Soil Amendment BuildASoil Basalt Rock Dust Soil Amendment BB101 from $20.99 Biobizz Pre-Mix Biobizz Biobizz Pre-Mix BBPM5L $17.99 BioPlastic Vacuum Sealer Bags – Compostable Storage 454 Bags BioPlastic Vacuum Sealer Bags – Compostable Storage BIOPLASTIC-VACU-1 from $34.00 Bosmere 30"x30"x30" Wire Compost Bin Bosmere Products Bosmere 30"x30"x30" Wire Compost Bin BOSK765 $128.99 BubbleSnake Compost Tea Aerator by TeaLAB BuildASoil BubbleSnake Compost Tea Aerator by TeaLAB BSA101 from $35.99 BuildASoil Charged Bio-Char BuildASoil BuildASoil Charged Bio-Char BC102C from $27.00 BuildASoil Kashi Gold BuildASoil BuildASoil Kashi Gold KGD104 $27.99 BuildASoil Mineral Kit - (For Peatmoss) BuildASoil BuildASoil Mineral Kit - (For Peatmoss) MK103 from $46.99 Commercial Air Pump For Compost Tea BuildASoil Commercial Air Pump For Compost Tea AIR301 from $62.99 Complete Compost Tea Brew Kit - TeaLAB BuildASoil Complete Compost Tea Brew Kit - TeaLAB BBK101 from $117.99 Diamond K Premium 97 Solution Grade Gypsum 50lbs Diamond K Diamond K Premium 97 Solution Grade Gypsum 50lbs DIAMOND97 $20.99 Earth Science 2.5 lbs Fast Acting Gypsum 500sf Encap Earth Science 2.5 lbs Fast Acting Gypsum 500sf ENC121326 $9.99 Earth Science Fast Acting Lime 5000sf Encap Earth Science Fast Acting Lime 5000sf ENC1188180 $26.99 Espoma 1cf Land & Sea Compost Espoma Espoma 1cf Land & Sea Compost ESPLSC1 $15.99 Espoma 4 lbs Compost Starter Espoma Espoma 4 lbs Compost Starter ESPCS4 $8.99 Espoma 4qt Horticultural Charcoal Espoma Espoma 4qt Horticultural Charcoal ESPHC4 $14.99 Fox Farms 1.5cf Happy Frog Soil Conditioner Fox Farm Fox Farms 1.5cf Happy Frog Soil Conditioner FXF590047 $16.99 Fox Farms 3cf Happy Frog Soil Conditioner (Not for FL IN or MO) Fox Farm Fox Farms 3cf Happy Frog Soil Conditioner (Not for FL IN or MO) FXF590030 $23.99 Gaia Green Organics Basalt Rock Dust, 2 kg U.S. Pouch Gaia Green Gaia Green Organics Basalt Rock Dust, 2 kg U.S. Pouch GAGBRD2KGP $12.99 Gaia Green Organics Glacial Rock Dust, 2 kg Pouch Gaia Green Gaia Green Organics Glacial Rock Dust, 2 kg Pouch GAGGRD2KGP $12.99 Gaia Green Organics Greensand, 1.25 kg Pouch Gaia Green Gaia Green Organics Greensand, 1.25 kg Pouch GAGGS1.25KGP $26.99