Soil Amendments

Want to learn more about soil amendments? Check out the GYOstuff guide to soil amendments.

1 - 108 of 108 items
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Down To Earth Alfalfa Meal 2.5-0.5-2.5 - 5 lb Down To Earth Alfalfa Meal 2.5-0.5-2.5 - 25 lb Down To Earth Azomite Slow Release Powder - 6 lb
Down To Earth Alfalfa Meal 2.5-0.5-2.5 - 5 lbDown To Earth Alfalfa Meal 2.5-0.5-2.5 - 25 lbDown To Earth Azomite Slow Release Powder - 6 lb

Soil conditioner, supplies trace elements, accelerates growth, and assists in composting.

Soil conditioner, supplies trace elements, accelerates growth, and assists in composting.

High quality trace minerals, fortifies soil, compost, or any medium.

$8.95

$8.39

$23.95

$22.99

$8.95

$8.29

Down To Earth Blood Meal 12-0-0 - 5 lb Down To Earth Blood Meal 12-0-0 - 5 lb Down To Earth Blood Meal 12-0-0 - 50 lb
Down To Earth Blood Meal 12-0-0 - 5 lbDown To Earth Blood Meal 12-0-0 - 20 lbDown To Earth Blood Meal 12-0-0 - 50 lb

Excellent source of nitrogen, perfect for heavy feeding plants.

Excellent source of nitrogen, perfect for heavy feeding plants.

Excellent source of nitrogen, perfect for heavy feeding plants.

$20.95

$19.69

$70.95

$66.69

$147.95

$138.99

Down To Earth Bone Meal 3-15-0 - 6 lb Down To Earth Bone Meal 3-15-0 - 6 lb Down To Earth Bone Meal 3-15-0 - 50 lb
Down To Earth Bone Meal 3-15-0 - 6 lbDown To Earth Bone Meal 3-15-0 - 25 lbDown To Earth Bone Meal 3-15-0 - 50 lb

Strongest type of organic bloom booster and root developer.

Strongest type of organic bloom booster and root developer.

Strongest type of organic bloom booster and root developer.

$12.95

$12.19

$42.95

$39.99

$70.95

$66.99

Down To Earth Cottonseed Meal 6-2-1 - 6 lb Down To Earth Cottonseed Meal 6-2-1 - 20 lb Down To Earth Cottonseed Meal 6-2-1 - 50 lb
Down To Earth Cottonseed Meal 6-2-1 - 6 lbDown To Earth Cottonseed Meal 6-2-1 - 20 lbDown To Earth Cottonseed Meal 6-2-1 - 50 lb

Slow release soil fertilizer for flowering acidic plants.

Slow release soil fertilizer for flowering acidic plants.

Slow release soil fertilizer for flowering acidic plants.

$11.95

$10.99

$28.95

$26.99

$56.95

$53.99

Down To Earth Crab Meal 4-3-0 - 5 lb Down To Earth Crab Meal 4-3-0 - 20 lb Down To Earth Crab Meal 4-3-0 - 40 lb
Down To Earth Crab Meal 4-3-0 - 5 lbDown To Earth Crab Meal 4-3-0 - 20 lbDown To Earth Crab Meal 4-3-0 - 40 lb

Supplies organic nutrition, and enhances microbial population in the soil.

Supplies organic nutrition, and enhances microbial population in the soil.

Supplies organic nutrition, and enhances microbial population in the soil.

$10.95

$9.99

$34.95

$32.79

$62.95

$58.99

Down To Earth Feather Meal 12-0-0 - 5 lb Down To Earth Feather Meal 12-0-0 - 20 lb Down To Earth Feather Meal 12-0-0 - 50 lb
Down To Earth Feather Meal 12-0-0 - 5 lbDown To Earth Feather Meal 12-0-0 - 20 lbDown To Earth Feather Meal 12-0-0 - 50 lb

Slow release nitrogen for heavy feeding plants.

Slow release nitrogen for heavy feeding plants.

Slow release nitrogen for heavy feeding plants.

$14.95

$13.99

$45.95

$42.99

$92.95

$86.99

Down To Earth Fish Bone Meal 3-16-0 - 6 lb Down To Earth Fish Bone Meal 3-16-0 - 25 lb Down To Earth Fish Bone Meal 3-16-0 - 50 lb
Down To Earth Fish Bone Meal 3-16-0 - 6 lbDown To Earth Fish Bone Meal 3-16-0 - 25 lbDown To Earth Fish Bone Meal 3-16-0 - 50 lb

Fish fertilizer for flowering plants, contains phosphorus and calcium.

Fish fertilizer for flowering plants, contains phosphorus and calcium.

Fish fertilizer for flowering plants, contains phosphorus and calcium.

$9.95

$8.99

$31.95

$29.99

$51.95

$48.99

Down To Earth Fish Meal 8-6-0 - 5 lb Down To Earth Fish Meal 8-6-0 - 20 lb Down To Earth Fish Meal 8-6-0 - 50 lb
Down To Earth Fish Meal 8-6-0 - 5 lbDown To Earth Fish Meal 8-6-0 - 20 lbDown To Earth Fish Meal 8-6-0 - 50 lb

Fish fertilizer for vegetable gardens, supplies nitrogen and phosphorus.

Fish fertilizer for vegetable gardens, supplies nitrogen and phosphorus.

Fish fertilizer for vegetable gardens, supplies nitrogen and phosphorus.

$20.95

$19.69

$70.95

$66.99

$141.95

$133.99

Down To Earth Fish Powder 12-1-1 - 1 lb Down To Earth Fish Powder 12-1-1 - 5 lb Down To Earth Granular Humic Acid - 25 lb
Down To Earth Fish Powder 12-1-1 - 1 lbDown To Earth Fish Powder 12-1-1 - 5 lbDown To Earth Granular Humic Acid - 25 lb

High quality nitrogen fertilizer, more effective than liquid fish fertilizers.

High quality nitrogen fertilizer, more effective than liquid fish fertilizers.

Excellent source of humic acid for increased nutrient uptake.

$11.95

$11.19

$42.95

$39.99

$22.95

$21.49

Down To Earth Granular Humic Acid - 50 lb Down To Earth Kelp Meal - 5 lb Down To Earth Kelp Meal - 20 lb
Down To Earth Granular Humic Acid - 50 lbDown To Earth Kelp Meal - 5 lbDown To Earth Kelp Meal - 20 lb

Excellent source of humic acid for increased nutrient uptake.

Potash source ideal for early Spring or Fall.

Potash source ideal for early Spring or Fall.

$35.95

$33.99

$19.95

$18.99

$66.95

$62.99

Down To Earth Kelp Meal - 50 lb Down To Earth Langbeinite (Sul-Po-Mag) 0-0-22 - 5 lb Down To Earth Langbeinite (Sul-Po-Mag) 0-0-22 - 50 lb
Down To Earth Kelp Meal - 50 lbDown To Earth Langbeinite (Sul-Po-Mag) 0-0-22 - 5 lbDown To Earth Langbeinite (Sul-Po-Mag) 0-0-22 - 50 lb

Potash source ideal for early Spring or Fall.

Unique combination of Potassium Magnesium and Sulfur.

Unique combination of Potassium Magnesium and Sulfur.

$149.95

$139.99

$10.95

$9.99

$68.95

$63.99

Down To Earth Neem Seed Meal - 5 lb Down To Earth Neem Seed Meal - 20 lb Down To Earth Neem Seed Meal - 40 lb
Down To Earth Neem Seed Meal - 5 lbDown To Earth Neem Seed Meal - 20 lbDown To Earth Neem Seed Meal - 40 lb

Improves root systems and plant immune systems.

Improves root systems and plant immune systems.

Improves root systems and plant immune systems.

$15.95

$14.99

$49.95

$46.99

$79.95

$74.99

Down To Earth Organic Soybean Meal 7-2-1 - 5 lb Down To Earth Organic Soybean Meal 7-2-1 - 40 lb Down To Earth Oyster Shell - 6 lb
Down To Earth Organic Soybean Meal 7-2-1 - 5 lbDown To Earth Organic Soybean Meal 7-2-1 - 40 lbDown To Earth Oyster Shell - 6 lb

Slow release nitrogen for vegetative growth.

Slow release nitrogen for vegetative growth.

High quality calcium imrpoves root development and nutrient uptake.

$15.95

$14.99

$81.95

$76.99

$7.95

$7.49

Down To Earth Oyster Shell - 25 lb Down To Earth Oyster Shell - 50 lb Down To Earth Shrimp Meal 6-6-0 - 2 lb
Down To Earth Oyster Shell - 25 lbDown To Earth Oyster Shell - 50 lbDown To Earth Shrimp Meal 6-6-0 - 2 lb

High quality calcium imrpoves root development and nutrient uptake.

High quality calcium imrpoves root development and nutrient uptake.

All purpose fertilizer for many gardens and composting solutions.

$12.95

$12.49

$21.95

$20.99

$7.95

$7.49

Down To Earth Shrimp Meal 6-6-0 - 15 lb Neptune's Harvest Crab Shell, 4 lb Neptune's Harvest Crab Shell, 12 lb
Down To Earth Shrimp Meal 6-6-0 - 15 lbNeptune's Harvest Crab Shell, 4 lbNeptune's Harvest Crab Shell, 12 lb

All purpose fertilizer for many gardens and composting solutions.

Great source of calcium & magnesium

Great source of calcium & magnesium

$21.95

$20.59

$12.99

$11.99

$36.39

$34.19

Neptune's Harvest Crab Shell, 50 lb Neptune's Harvest Kelp Meal, 4 lb Neptune's Harvest Kelp Meal, 12 lb
Neptune's Harvest Crab Shell, 50 lbNeptune's Harvest Kelp Meal, 4 lbNeptune's Harvest Kelp Meal, 12 lb

Great source of calcium & magnesium

Excellent soil conditioner; rich source of minerals and plant hormones

Excellent soil conditioner; rich source of minerals and plant hormones

$78.99

$72.99

$17.59

$16.39

$54.99

$50.99

Neptune's Harvest Kelp Meal, 50 lb Feather Meal, 5 lb Espoma Organic Blood Meal 3.75 lbs
Neptune's Harvest Kelp Meal, 50 lbFeather Meal, 5 lbEspoma Organic Blood Meal 3.5 lbs

Excellent soil conditioner; rich source of minerals and plant hormones

Nitrogen rich fertilizer

Organic source of nitrogen; also repels many animals

$116.99

$108.99

$11.99

$9.99

$15.28

$14.99

Espoma Organic Bone Meal 4.5 lb Espoma Organic Cottonseed Meal 3.5 lbs Espoma Garden Gypsum 5 lb
Espoma Organic Bone Meal 4.5 lbEspoma Organic Cottonseed Meal 3.5 lbsEspoma Organic Garden Gypsum 6 lb

Natural source of phosphorus and nitrogen

Organic plant food for trees & shrubs

Promotes root growth; loosens heavy soils

$10.95

$10.29

$9.95

$9.49

$8.95

$8.69

Espoma Organic Garden Gypsum 36 lb Espoma Organic Garden Lime, 6.75 lb Espoma Organic Greensand 7.5 lb
Espoma Organic Garden Gypsum 36 lbEspoma Organic Garden Lime, 6.75 lbEspoma Organic Greensand 7.5 lb

Promotes root growth; loosens heavy soils

Adjusts the pH of excessively acidic soils

Contains potash and other minerals from natural marine deposits

$19.99

$19.49

$4.95

$4.79

$13.95

$13.69

Espoma Organic Iron-Tone 5 lb Espoma Organic Kelp Meal 4 lb Espoma Organic Peat Moss 8 qt
Espoma Organic Iron-Tone 5 lbEspoma Organic Kelp Meal 4 lbEspoma Organic Peat Moss 8 qt

Turns yellow to green natutrally

Excellent soil conditioner; rich source of minerals and plant hormones

Helps aerate and retain moisture

$8.95

$8.49

$21.95

$20.69

$7.95

$7.79

Espoma Organic Rock Phosphate 7.25 lb Espoma Organic Rock Phosphate 28 lb Espoma Organic Vermiculite 8 qt
Espoma Organic Rock Phosphate 7.25 lbEspoma Organic Rock Phosphate 28 lbEspoma Organic Vermiculite 8 qt

All natural root & bloom enhancer

All natural root & bloom enhancer

Light-weight seed starter, aerator and mushroom growing substrate

$12.49

$12.19

$26.99

$25.99

$9.95

$9.79

Espoma Potash 6 lb Grow More Dolomite Lime 4 lbs Dolomite Lime, 50 lb
Espoma Potash 6 lbGrow More Dolomite Lime 4 lbsDolomite Lime, 50 lb

Potassium supplement, promotes plant vigor

Helps correct acidic soil environments

Helps correct acidic soil environments

$14.49

$13.99

$8.95

$8.49

$25.99

$25.49

Happy Frog Soil Conditioner 3 cu ft Happy Frog Steamed Bone Meal, 4 lb Granular Azomite, 10 lb
Happy Frog Soil Conditioner 3 cu ftHappy Frog Steamed Bone Meal, 4 lbGranular Azomite, 10 lb

Includes forest humus, castings, guano, microbes and more

For healthy plant growth and spectacular flowers

Contains over 70 minerals and trace elements

$31.95

$29.99

$10.95

$10.49

$24.99

$23.79

Micronized Azomite, 44 lb Ancient Forest Humus Soil Amendment .5 cu ft VermiBlend Soil Amendment, 1 cu ft
Micronized Azomite, 44 lbAncient Forest Humus Soil Amendment .5 cu ftVermiBlend Soil Amendment, 1 cu ft

Contains over 70 minerals and trace elements

Also used to make compost or humus tea

Blend of compost, earthworm castings, humus, kelp and mycorrhizae

$46.99

$45.99

$16.30

$15.99

$27.95

$25.99

VermiWorm Premium Worm Castings .75 cu ft Wiggle Worm, 4.5lbs. Wiggle Worm, 15lbs.
VermiWorm Premium Worm Castings .75 cu ftWiggle Worm Earthworm Castings, 4.5 lbs.Wiggle Worm Earthworm Castings, 15 lbs.

Premium natural and organic soil conditioner

Pure worm castings organic fertilizer

Pure worm castings organic fertilizer

$37.95

$33.99

$6.00

$5.89

$14.95

$13.99

Wiggle Worm, 30lbs. Nature's Solution Organic Worm Castings, 5 lbs Nature's Solution Organic Worm Castings, 20 lbs
Wiggle Worm Earthworm Castings, 30 lbs.Nature's Solution Organic Worm Castings, 5 lbsNature's Solution Organic Worm Castings, 20 lbs

Pure worm castings organic fertilizer

Pure worm castings; organic fertilizer

Pure worm castings; organic fertilizer

$24.95

$22.99

$15.95

$15.49

$30.95

$28.99

Roots Organics Big Worm Worm Castings, 1 cu ft Black Gold Earthworm Castings, 16 qt Greensand, 50 lb
Roots Organics Big Worm Worm Castings, 1 cu ftBlack Gold Earthworm Castings, 16 qtGreensand, 50 lb

Organic soil amendment and conditioner

Natural and organic soil conditioner

Contains potash and other minerals from natural marine deposits

$54.95

$49.99

$14.95

$14.49

$62.50

$61.99

MaxiCrop Kelp Meal 5 lb. Mother Earth Meal Mix Grow Media Amendment, 4.4 lbs Mother Earth Meal Mix Grow Media Amendment, 25 lbs
MaxiCrop Kelp Meal 5 lb.Mother Earth Meal Mix Grow Media Amendment, 4.4 lbsMother Earth Meal Mix Grow Media Amendment, 25 lbs

Excellent soil conditioner; rich source of minerals and plant hormones

Use for robust lush vegetative growth with compact internode spacing.

Use for robust lush vegetative growth with compact internode spacing.

$17.15

$15.99

$15.95

$14.99

$57.95

$53.99

Mother Earth Meal Mix Grow Media Amendment, 50 lbs Mother Earth Meal Mix Bloom Media Amendment, 4.4 lbs Mother Earth Meal Mix Bloom Media Amendment, 25 lbs
Mother Earth Meal Mix Grow Media Amendment, 50 lbsMother Earth Meal Mix Bloom Media Amendment, 4.4 lbsMother Earth Meal Mix Bloom Media Amendment, 25 lbs

Use for robust lush vegetative growth with compact internode spacing.

Use to promote ample amounts of high quality fruit and flower development.

Use to promote ample amounts of high quality fruit and flower development.

$103.95

$96.99

$15.95

$14.99

$57.95

$53.99

Mother Earth Meal Mix Bloom Media Amendment, 50 lbs Mother Earth Premium BioChar, 1 cu ft Mother Earth Chicken Manure, 25 lbs.
Mother Earth Meal Mix Bloom Media Amendment, 50 lbsMother Earth Premium BioChar, 1 cu ftMother Earth Chicken Manure, 25 lbs.

Use to promote ample amounts of high quality fruit and flower development.

Fast & easy way to boost soil performance

Great, high nitrogen amendment and soil aerator.

$103.95

$96.99

$34.95

$31.99

$11.95

$10.99

Earth Shine Soil Booster with Biochar, 1 lb Earth Shine Soil Booster with Biochar, 2 lbs Earth Shine Soil Booster with Biochar, 5 lbs
Earth Shine Soil Booster with Biochar, 1 lbEarth Shine Soil Booster with Biochar, 2 lbsEarth Shine Soil Booster with Biochar, 5 lbs

All-in-one natural soil booster

All-in-one natural soil booster

All-in-one natural soil booster

$16.95

$15.99

$23.95

$22.49

$38.95

$36.49

Earth Shine Soil Booster with Biochar, 15 lbs Actino Iron Biological Funugicide 9 oz Plant!t Super Coarse Perlite, 50L/1.7 cu ft
Earth Shine Soil Booster with Biochar, 15 lbsActino Iron Biological Funugicide 9 ozPlant!t Super Coarse Perlite, 50L/1.7 cu ft

All-in-one natural soil booster

All the garden disease-prenention benefits of Actinovate plus iron.

Light-weight seed starter and soil aerator

$124.95

$117.49

$10.99

$21.95

$19.99

Plant!t Super Coarse Perlite, 100L/3.5 cu ft Perl-Lome Expanded Perlite, 8 qt Perl-Lome Expanded Perlite, 20 qt
Plant!t Super Coarse Perlite, 100L/3.5 cu ftPerl-Lome Expanded Perlite, 8 qtPerl-Lome Expanded Perlite, 20 qt

Light-weight seed starter and soil aerator

Light-weight seed starter and soil aerator.

Light-weight seed starter and soil aerator.

$31.95

$29.99

$6.99

$6.49

$13.49

$12.99

Sunshine Perlite #3, 4 cu ft FoxFarm Big & Chunky Perlite - 4 cu ft Aurora Innovations Precision Perlite #4 2 cu ft
Sunshine Perlite #3, 4 cu ftFoxFarm Big & Chunky Perlite - 4 cu ftAurora Innovations Precision Perlite #4 2 cu ft

Light-weight seed starter and soil aerator

Light-weight seed starter and soil aerator

Light-weight seed starter and soil aerator

$60.95

$56.99

$78.95

$72.99

$20.95

$18.99

Aurora Innovations Precision Perlite #4 4 cu ft Mica-Grow Vermiculite Soil Additive, 8 qt Mica-Grow Vermiculite Soil Additive, 20 qt
Aurora Innovations Precision Perlite #4 4 cu ftMica-Grow Vermiculite Soil Additive, 8 qtMica-Grow Vermiculite Soil Additive, 20 qt

Light-weight seed starter and soil aerator

Light-weight seed starter, aerator and mushroom growing substrate.

Light-weight seed starter, aerator and mushroom growing substrate.

$38.95

$35.99

$6.95

$6.49

$16.49

$15.99

Coarse Vermiculite - 4 cu ft Sulfur Prills, 2 lb Sulfur Prills, 4 lb
Coarse Vermiculite - 4 cu ftSulfur Prills, 2 lbSulfur Prills, 4 lb

Light-weight seed starter, aerator and mushroom growing substrate

99.9% pure sulfur prills - great for stopping diseases in your garden.

99.9% pure sulfur prills - great for stopping diseases in your garden.

$73.95

$67.99

$8.95

$8.39

$13.95

$12.99

1 - 108 of 108 items

 Please note that most bulk soil amendments does not qualify for free shipping.