Soil Amendments

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

1 - 60 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

1 - 60 of 108 items

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