10 Best Fertilizer For Onions 2020

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

After analyzing products, scanning reviews, spending more than 36 hours of research and speaking with our test users, we think the Organic Onion Fertilizer is the one of the Best Fertilizer For Onions on the market.

# Image Name Brand Price
1
⭐Best Choice
Organic Onion Fertilizer
Organic Onion Fertilizer Check price Homesteader Hobbies $$$$$ Check price
2 Burpee Organic Bone Meal Fertilizer Burpee Organic Bone Meal Fertilizer, 3 lb (1 Pack) Check price Burpee $$$$$ Check price
3
👑Premium Pick
Ammonium Sulfate Fertilizer | Great for Onions
Ammonium Sulfate Fertilizer | Great for Onions, Garlic & Shallots! | 10 lb Bag Check price Hoss Tools $$$$$ Check price
4
💲Best value for the money
Hi-Yield Ammonium Sulfate 4LB AMMONIUM SULFATE
Hi-Yield Ammonium Sulfate 4LB AMMONIUM SULFATE Check price Hi-Yield $$$$$ Check price
5 Ammonium Sulfate (1 Gallon Bucket Ammonium Sulfate (1 Gallon Bucket, 9 lbs) by Earthborn Elements, Soil Fertilizer, Rich in Nitrogen, Lowers pH, Inorganic Salt, Improves Plant & Soil Quality, Agricultural Uses, Resealable Bucket Check price Earthborn Elements $$$$$ Check price
6 Ultimate Fertilizer The 10 lb Veg Garden Fertilizer Ultimate Fertilizer The 10 lb Veg Garden Fertilizer Check price N/A $$$$$ Check price
7 Urea Urea - (NH2)2CO - 5 Pounds Check price N/A $$$$$ Check price
8 Cottonseed Meal Fertilizer 5-2-1"Greenway Biotech Brand" 5 Pounds Cottonseed Meal Fertilizer 5-2-1"Greenway Biotech Brand" 5 Pounds Check price Greenway Biotech, Inc. $$$$$ Check price
9 Ammonium Sulfate 21-0-0 Fertilizer"Greenway Biotech Brand" 2 Pounds Ammonium Sulfate 21-0-0 Fertilizer"Greenway Biotech Brand" 2 Pounds Check price Greenway Biotech, Inc. $$$$$ Check price
10 Scotts Bulb Continuous Release Plant Food Scotts Bulb Continuous Release Plant Food, 3-Pound Check price Scotts $$$$$ Check price

Organic Onion Fertilizer – Best Overall Fertilizer For Onion

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.

Burpee Organic Bone Meal Fertilizer

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
  • Organic certified - OMRI listed for Organic gardening

Hi-Yield Ammonium Sulfate 4LB AMMONIUM SULFATE – Best Budget Fertilizer For Onion

Hi-Yield Ammonium Sulfate 4LB AMMONIUM SULFATE
  • Sold on Amazon

Ammonium Sulfate (1 Gallon Bucket

Ammonium Sulfate (1 Gallon Bucket
  • EFFECTIVE SOIL FERTILIZER & ACIDIFIER
  • NITROGEN-RICH FOR IMPROVED SOIL
  • IMPROVES QUALITY OF BOTH SOIL & PLANTS
  • MAKES PLANTS EASIER TO DIGEST FOR LIVESTOCK
  • VARIOUS AGRICULTURAL USES

Ultimate Fertilizer The 10 lb Veg Garden Fertilizer

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

Urea

Urea
  • Fertilizer/Animal Feed Grade
  • Fine Prill
  • 46-0-0 Fertilizer
  • Used in fertilizers, gold refining, many household products, and many other uses
  • We sell in bulk for so many different uses, we don't include any specific use instructions

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

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.

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

Scotts Bulb Continuous Release Plant Food

Scotts Bulb Continuous Release Plant Food
  • Feeds and promotes beautiful color for up to 2 months
  • Easy to use- simply apply directly to the soil
  • Feeds new bulbs at planting and throughout flowering
  • Feeds established bulbs in the fall for more beautiful blooms next year
  • Analysis: 10-12-10

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