Soil Amendments

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

61 - 108 of 108 items
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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

61 - 108 of 108 items

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