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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 Wiscassett Earthworm Castings — priced per each; minimum 6; multiples of 6 Coast of Maine CME 8qt Wiscassett Earthworm Castings — priced per each; minimum 6; multiples of 6 CMEWI4500 $22.29 per each; minimum 6 Earth Science 12# Earth Worm Castings — priced per each; minimum 4; multiples of 4 Encap Earth Science 12# Earth Worm Castings — priced per each; minimum 4; multiples of 4 ENC118964 $26.69 per each; minimum 4 Earth Science 4# Earth Worm Castings — priced per each; minimum 6; multiples of 6 Encap Earth Science 4# Earth Worm Castings — priced per each; minimum 6; multiples of 6 ENC121306 $12.99 per each; minimum 6 Greengro 4# Premium Worm Castings Greengro Biologicals Llc Greengro 4# Premium Worm Castings GGBPWC4 $18.99 per each Pearl Valley 15# Healthy Grow High Quality Worm Castings Pearl Valley Organix Pearl Valley 15# Healthy Grow High Quality Worm Castings PVOHGRWC15 $38.29 per each Black Kow.5cf Compost Cow Manure Black (gold) Kow Black Kow.5cf Compost Cow Manure BGE226106 $9.49 per each CME 1cf Quoddy Blend Lobster Compost — priced per each; minimum 5; multiples of 5 Coast Of Maine Organic Product CME 1cf Quoddy Blend Lobster Compost — priced per each; minimum 5; multiples of 5 CMEQD1000 $23.29 per each; minimum 5 Royal Gold 1cf Worm Castings Royal Gold Llc Royal Gold 1cf Worm Castings RGSRGWC01P $32.74 per each True Organic 4# Worm Castings — priced per each; minimum 6; multiples of 6 True Organic Products True Organic 4# Worm Castings — priced per each; minimum 6; multiples of 6 TRUR0054 $10.69 per each; minimum 6 Unco Wiggle Worm 15# Soil Builder Worm Castings Unco Industries Unco Wiggle Worm 15# Soil Builder Worm Castings UII603 $19.99 per each Unco Wiggle Worm 30# Soil Builder Worm Castings Unco Industries Unco Wiggle Worm 30# Soil Builder Worm Castings UII604 $30.99 per each Unco Wiggle Worm 4.5# Soil Builder Worm Castings — priced per each; minimum 12; multiples of 12 Unco Industries Unco Wiggle Worm 4.5# Soil Builder Worm Castings — priced per each; minimum 12; multiples of 12 UII602 $11.29 per each; minimum 12 WormGanics 1cf OrganicWorm Castings Silver Bait WormGanics 1cf OrganicWorm Castings WRGWG25 $21.99 per each Espoma.75cf Mushroom Compost Espoma Espoma.75cf Mushroom Compost ESPMC75 $9.99 per each Wormgold Plus Castings 8qt — priced per each; minimum 3; multiples of 3 California Vermiculture Wormgold Plus Castings 8qt — priced per each; minimum 3; multiples of 3 CAV8QTWGPLUS $10.99 per each; minimum 3 Algreen Soil Saver Classic Composter Algreen Algreen Soil Saver Classic Composter ALG01512 $171.99 Azomite AZOMITE Field Grade AZO-FIELD-44LB $24.99 Bosmere 30"x30"x30" Wire Compost Bin Bosmere Products Bosmere 30"x30"x30" Wire Compost Bin BOSK765 $142.99 per each Creekside 40# Compost With Manure — priced per each; minimum 60; multiples of 60 Creekside Soils Creekside 40# Compost With Manure — priced per each; minimum 60; multiples of 60 CRS003547 $6.99 per each; minimum 60 Earth Science 2.5# Fast Acting Gypsum 500sf — priced per each; minimum 6; multiples of 6 Encap Earth Science 2.5# Fast Acting Gypsum 500sf — priced per each; minimum 6; multiples of 6 ENC121326 $9.99 per each; minimum 6 Earth Science Fast Acting Lime 5000sf Encap Earth Science Fast Acting Lime 5000sf ENC1188180 $26.69 per each Espoma 1cf Land & Sea Compost Espoma Espoma 1cf Land & Sea Compost ESPLSC1 $15.29 per each Espoma 4qt Horticultural Charcoal — priced per each; minimum 12; multiples of 12 Espoma Espoma 4qt Horticultural Charcoal — priced per each; minimum 12; multiples of 12 ESPHC4 $14.99 per each; minimum 12 Fertilome 3# Compost Maker — priced per each; minimum 12; multiples of 12 Voluntary Purchasing Group Fertilome 3# Compost Maker — priced per each; minimum 12; multiples of 12 VOLFL16144 $9.99 per each; minimum 12 GreenGro Earthshine 2lb Biochar Blend — priced per each; minimum 8; multiples of 8 Greengro Biologicals Llc GreenGro Earthshine 2lb Biochar Blend — priced per each; minimum 8; multiples of 8 GGBES3002 $17.79 per each; minimum 8 HiYield 4# Horticultural Hydrated Lime — priced per each; minimum 6; multiples of 6 Voluntary Purchasing Group HiYield 4# Horticultural Hydrated Lime — priced per each; minimum 6; multiples of 6 VOLHY34371 $8.98 per each; minimum 6 Hoffman 20#Composted Cow Manure 1-1-1 — priced per each; minimum 5; multiples of 5 Good Earth Organics Corp. Hoffman 20#Composted Cow Manure 1-1-1 — priced per each; minimum 5; multiples of 5 HOF21045 $8.99 per each; minimum 5 Hoffman 24oz Charcoal — priced per each; minimum 12; multiples of 12 Good Earth Organics Corp. Hoffman 24oz Charcoal — priced per each; minimum 12; multiples of 12 HOF17502 $11.59 per each; minimum 12 Hoffman 2qt Volcanic Lava Rock — priced per each; minimum 10; multiples of 10 Good Earth Organics Corp. Hoffman 2qt Volcanic Lava Rock — priced per each; minimum 10; multiples of 10 HOF14452 $10.79 per each; minimum 10 Hoffman 8# Garden Lime Pelletized — priced per each; minimum 6; multiples of 6 Good Earth Organics Corp. Hoffman 8# Garden Lime Pelletized — priced per each; minimum 6; multiples of 6 HOF15208 $11.89 per each; minimum 6 JRM 1# Soil Moist Granular Jar SOILMOIST — priced per each; minimum 6; multiples of 6 Jrm Chemical JRM 1# Soil Moist Granular Jar SOILMOIST — priced per each; minimum 6; multiples of 6 JRCJCD100SMJ $19.99 per each; minimum 6 JRM 3# Soil Moist Granular Container — priced per each; minimum 6; multiples of 6 Jrm Chemical JRM 3# Soil Moist Granular Container — priced per each; minimum 6; multiples of 6 JRCJCD030SM $48.99 per each; minimum 6 JRM 40# Soil Moist Granular 6Gal Pail Jrm Chemical JRM 40# Soil Moist Granular 6Gal Pail JRCJCD40BKSM $496.99 per each JRM 50# Soil Moist Granular Fiber Box Jrm Chemical JRM 50# Soil Moist Granular Fiber Box JRCJCD50BKSM $561.99 per each JRM 8# Soil Moist Granular 2Gal Pail Jrm Chemical JRM 8# Soil Moist Granular 2Gal Pail JRCJCD08BKSM $116.99 per each JRM 8oz Jar Container Mix Plus Mycorrhiza w/ Fertilizer 3-3-3 — priced per each; minimum 12; multiples of 12 Jrm Chemical JRM 8oz Jar Container Mix Plus Mycorrhiza w/ Fertilizer 3-3-3 — priced per each; minimum 12; multiples of 12 JRCJCD05CMP $12.59 per each; minimum 12 Lewis Tools Compost Aerator Lewis Lifetime Tools Lewis Tools Compost Aerator LEWCA36 $43.99 per each Luster Leaf Compost Thermometer Luster Leaf Products Luster Leaf Compost Thermometer LUS1635 $28.99 per each Mi Peat 40# Garden Magic Compost & Manure Michigan Peat Mi Peat 40# Garden Magic Compost & Manure MPC5240 $24.19 per each Mi Peat 40qt The Cow Compost & Manure (Formerly Wholly Cow) Michigan Peat Mi Peat 40qt The Cow Compost & Manure (Formerly Wholly Cow) MPC1640 $27.49 per each Miracle Gro 12oz Water Storing Crystals — priced per each; minimum 5; multiples of 5 The Scotts Miracle Gro 12oz Water Storing Crystals — priced per each; minimum 5; multiples of 5 181-00831 $15.39 per each; minimum 5 Mosser 1.5qt Black Sand — priced per each; minimum 8; multiples of 8 Mosser Lee Mosser 1.5qt Black Sand — priced per each; minimum 8; multiples of 8 MLC1112 $7.59 per each; minimum 8 Mosser 1.5qt Desert Sand — priced per each; minimum 8; multiples of 8 Mosser Lee Mosser 1.5qt Desert Sand — priced per each; minimum 8; multiples of 8 MLC1110 $7.59 per each; minimum 8 Mosser 1.5qt Pearl Stone — priced per each; minimum 8; multiples of 8 Mosser Lee Mosser 1.5qt Pearl Stone — priced per each; minimum 8; multiples of 8 MLC1122 $12.89 per each; minimum 8 Mosser 1.5qt White Sand — priced per each; minimum 8; multiples of 8 Mosser Lee Mosser 1.5qt White Sand — priced per each; minimum 8; multiples of 8 MLC1111 $7.59 per each; minimum 8 Mosser 2.25qt Organic Horticultural Charcoal — priced per each; minimum 12; multiples of 12 Mosser Lee Mosser 2.25qt Organic Horticultural Charcoal — priced per each; minimum 12; multiples of 12 MLCML0810 $12.99 per each; minimum 12 Mosser 250cuin Spanish Moss — priced per each; minimum 8; multiples of 8 Mosser Lee Mosser 250cuin Spanish Moss — priced per each; minimum 8; multiples of 8 MLC05608 $7.39 per each; minimum 8 Mosser 5# Natural Pebbles — priced per each; minimum 8; multiples of 8 Mosser Lee Mosser 5# Natural Pebbles — priced per each; minimum 8; multiples of 8 MLCML1123 $9.99 per each; minimum 8