10 Best Fertilizer For Onions 2021

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

Organic Onion Fertilizer – ⭐ Best Overall Fertilizer For Onion

HSHIHGK617 by Homesteader Hobbies

  • Dimensions: 6 x 11 x 4 inches
Organic Onion Fertilizer
  • 3 lbs. Organic Onion Fertilizer
  • All-Natural & Non-GMO Sourced Onion Fertilizer (3-4-3).
  • 3 lbs. will feed 240 onion plants for an entire season.
  • Guaranteed to increase yields, size, health and vigor of your onion plants.
  • Derived from: Fish Bone Meal, Gypsum, Blood Meal, Alfalfa Meal, Sulfate of Potash & Feather Meal.

Ammonium Sulfate Fertilizer | Great for Onions – 👑 Premium Pick

by Hoss Tools

Ammonium Sulfate Fertilizer | Great for Onions

Vegetables Love Flowers: Companion Planting for Beauty and Bounty

  • Release date: 03/27/2018
Vegetables Love Flowers: Companion Planting for Beauty and Bounty

Hi-Yield Ammonium Sulfate 4LB AMMONIUM SULFATE

32177 by Hi-Yield

  • Weight: 4.05 pounds
  • Dimensions: 10.4 x 5.4 x 2.3 inches
Hi-Yield Ammonium Sulfate 4LB AMMONIUM SULFATE
  • Sold on Amazon

Burpee Organic Bone Meal Fertilizer

Organic by Burpee

  • Color: 3 lb (1 Pack)
  • Weight: 3 pounds
  • Dimensions: 4 x 10.3 x 12.5 inches
Burpee Organic Bone Meal Fertilizer
  • Why bone meal? - provides vital Organic nitrogen, phosphorus and calcium
  • Strong roots, vibrant blooms - promotes strong roots, vibrant blooms and more delicious vegetables
  • When TO treat - early-season addition of phosphorus to soil will promote strong root development, enhance early growth, and superior blossoms and fruit at harvest time. May be added at to soil any time prior to harvesting to enhance plant growth
  • The earlier the better - Boosts young plants and helps them stay strong throughout the growing season
  • Ideal for fall bulb planting - promotes healthy growth of root crops and other vegetables

Espoma Garden-Tone Plant Food – 💲 Best Budget Fertilizer For Onion

GT4 by Espoma

  • Weight: 4 pounds
  • Dimensions: 8 x 5 x 5 inches
Espoma Garden-Tone Plant Food
  • An all natural and organic plant food enhanced with thousands of living microbes and is approved for organic gardening
  • It is perfect for all vegetables and provides a safe, continuous, and complete balanced feeding
  • Made in United States
  • A complete plant food with all 15 essential nutrients
  • Originally developed for professional gardeners
  • Complex blend of natural organics provide complete and balanced feeding of all 15 nutrients
  • Environmentally safe
  • No sludges, hazardous or toxic ingredients

Ammonium Sulfate 21-0-0 Fertilizer"Greenway Biotech Brand" 2 Pounds

TRTAZ11A by Greenway Biotech, Inc.

  • Weight: 2 pounds
Ammonium Sulfate 21-0-0 Fertilizer"Greenway Biotech Brand" 2 Pounds
  • 2 Pounds of Greenway Biotech Ammonium Sulfate Fertilizer 21-0-0
  • Contains 21% Water Soluble Nitrogen and 24% Sulfur
  • Excellent Source of Water Soluble Nitrogen Fertilizer
  • Great and Affordable Fertilizer for Your Lawn
  • Due to 24% of Sulfur is Very suitable for Acid Loving Plants and to Lower pH Levels in Alkaline Soil

Ultimate Fertilizer The 10 lb Veg Garden Fertilizer

150 by Ultimate Fertilizer

  • Dimensions: 17 x 11 x 2 inches
Ultimate Fertilizer The 10 lb Veg Garden Fertilizer
  • Ultimate Fertilizer #150 10Lb Vegetable Garden Fertilizer
  • Ultimate Fertilizer Co, The
  • This Product Is Manufactured In China

Ammonium Sulfate (1 Gallon Bucket

by Earthborn Elements

Ammonium Sulfate (1 Gallon Bucket
  • Effective soil additive & acidifier
  • Nitrogen-rich for improved soil, lowering pH levels in soil
  • Use in a well-ventilated area
  • Makes plants easier to digest for livestock
  • Various agricultural uses

Cottonseed Meal Fertilizer 5-2-1"Greenway Biotech Brand" 5 Pounds

by Greenway Biotech, Inc.

Cottonseed Meal Fertilizer 5-2-1"Greenway Biotech Brand" 5 Pounds
  • Promotes vigorous and robust growth.
  • Lower soil PH, making it convenient for a surge in elements like iron and magnesium in the soil.
  • Holds high organic content and Suitable for aeration of tight and dense soil.
  • Aids in moisture retention in light and sandy soil and Infused with seven essential strains of beneficial soil microbes.
  • Non-GMO and Heavy Metal Free.

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