Top 10 Best Onion Fertilizer Based on Score 2022

We have gone through 10 of the best onion fertilizer to help you decide. Also researched to ensure how to choose a onion fertilizer.

Disclaimer: Our editing teams independently research, review, and recommend the best products based on extensive data analysis; if you click on the product links, we may earn a commission from qualifying purchases. But it never influences our product selection process., read more.

Comparison Table of Top 10 Best Onion Fertilizer

Rank Image NameScoreMore Info
1 Espoma GT4 4-Pound Garden-Tone 3-4-4 Plant Food9.7 Check Price On Amazon
2 Burpee Bone Meal Fertilizer | Add to Potting Soil | Strong Root Development | OMRI Listed for Organic Gardening | for Tomatoes, Peppers, and Bulbs, 1-Pack, 3 lb (1 Pack)9.6 Check Price On Amazon
3 Southern Ag All Purpose Granular Fertilizer 10-10-10, 5 LB9.3 Check Price On Amazon
4 The Old Farmer’s Almanac 2.25 lb. Organic Tomato & Vegetable Plant Food Fertilizer, Covers 250 sq. ft. (1 Bag)9.3 Check Price On Amazon
5 J R Peters 52024 Jacks Classic No.1.5 20-20-20 All Purpose Fertilizer9.2 Check Price On Amazon
6 AeroGarden Liquid Nutrients (1 Liter)9.0 Check Price On Amazon
7 Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Poly Bag8.9 Check Price On Amazon
8 Miracle-Gro Water Soluble All Purpose Plant Food, 10 lbs.8.5 Check Price On Amazon
9 The Dirty Gardener Nitrogen Fertilizer Urea 46-0-0, 5 Pounds8.1 Check Price On Amazon
10 The Old Farmer’s Almanac Tree & Shrub Fertilizer Spikes (Box of 6 Spikes)7.6 Check Price On Amazon
Top onion fertilizer in 2022

Best Onion Fertilizer Features

1. Espoma GT4 4-Pound Garden-Tone 3-4-4 Plant Food

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Product Features:

  • 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

2. Burpee Bone Meal Fertilizer | Add to Potting Soil | Strong Root Development | OMRI Listed for Organic Gardening | for Tomatoes, Peppers, and Bulbs, 1-Pack, 3 lb (1 Pack)

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Product Features:

  • STRONGER ROOT DEVELOPMENT: Bone Meal is a natural source of vital, readily available organic nitrogen, phosphorus and calcium that promotes strong plant roots, vibrant blooms and more delicious vegetables. Helps to enhance your plants throughout the growing season!
  • ADD TO SOIL: Add to soil or potting mix during seed starting or at any time prior to harvest to fuel strong roots and early, healthy plant growth. Bone meal fertilizer breaks down slowly, releasing nitrogen for robust growth throughout the season. Follow packaging instructions for the amount to use.
  • ORGANIC CERTIFIED: OMRI listed for organic gardening, Bone Meal is ideal for new bedding plants, giving established home flower gardens a boost, and keeping patio containers looking their best and brightest. Helps naturally deter rabbits from your garden.
  • IDEAL FOR FALL BULB PLANTING: Bone meal naturally promotes healthy growth of root and bulb crops and has a fine granular consistency for easy spreading. You can also use when planting flowering bulbs in the fall, such as tulips. Plus, it’s Made in the USA!
  • 100% GUARANTEED: Burpee is committed to the success of all gardeners. We treat each order with care to ensure healthy seeds, plants, soil mixes and gardening supplies are sent in excellent condition. Loved by gardens and trusted by gardeners, Burpee has been introducing fresh garden breakthroughs since 1876. Burpee offers only the highest quality, non-GMO seeds, hand-picked by expert horticulturalists.

3. Southern Ag All Purpose Granular Fertilizer 10-10-10, 5 LB

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Product Features:

  • Size: 5 LB
  • Uniform, homogenous granular formulation .
  • CONTAINS: 10% Nitrogen, 10% Phosphorus (P205), 10% Potassium (K20) plus minor elements .
  • APPLICATION: Broadcast evenly over area and water in.
  • For large quantity discount consideration or to request a mixed multi-pack, please message us.

4. The Old Farmer’s Almanac 2.25 lb. Organic Tomato & Vegetable Plant Food Fertilizer, Covers 250 sq. ft. (1 Bag)

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Product Features:

  • OMRI Listed granular fertilizer specially formulated for organic tomatoes, vegetables, fruits, herbs, trees and shrubs
  • Features both quick and slow release nutrients to promote healthy plant growth over time
  • High quality protein based nutrition suitable for indoor and outdoor gardens without manure, harsh chemicals or offensive smells
  • Easy pour resealable bag fertilizes up to 250 square feet of new or existing crops for 6-8 weeks
  • Nutrient rich 8-4-8 formula with 8% Nitrogen for plant growth and color; 4% Phosphorus for healthy fruits and blooms; and 8% Potassium for strong roots

5. J R Peters 52024 Jacks Classic No.1.5 20-20-20 All Purpose Fertilizer

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Product Features:

  • All indoor and outdoor plants, tree, vegetables and surf
  • It feeds both through the roots and the leaves. This formula of nitrogen, phosphorus and potassium provides fast green-up and rapid leaf expansion
  • Indoors it is especially effective on foliage plants, keeping leaves green. A proven performer in the vegetable garden for generations

6. AeroGarden Liquid Nutrients (1 Liter)

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Product Features:

  • Works in all Miracle-Gro AeroGarden models
  • Additional nutrients for your AeroGarden. More than 100 feedings
  • Also great for indoor and outdoor plants, shrubs and trees
  • Patented, pH buffering system great for all hydroponic applications
  • One-part nutrient perfect for seedlings, vegetative growth and flowering

7. Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Poly Bag

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Product Features:

  • For more nutritious and tasty vegetables
  • Optimum levels of primary plant nutrients
  • Contains no GMOs, chicken manure or sewage sludge
  • Feeds for several months
  • Made with 100% organic and natural ingredients
  • Contains pro-biotic, seven champion strains of beneficial soil microbes plus ecto and endo mycorrhizae
  • More abundant crops; More nutritious and tasty vegetables
  • 100 percent natural and organic; Exceptional results because nutrients are released quickly; Feeds for several months; Consistent premium quality
  • Eight select strains of ecto and Endo Mycorrhizae contribute to drought tolerance, enhanced nutrient availability and increased plant performance
  • 100-Percent organic formula provides optimum levels of essential plant nutrients; eliminates the need for chemical fertilizers when used as directed

8. Miracle-Gro Water Soluble All Purpose Plant Food, 10 lbs.

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Product Features:

  • Full of essential nutrients, it instantly feeds to grow bigger, more beautiful plants versus unfed plants
  • Feed every 1-2 weeks
  • Use with the Miracle-Gro Garden Feeder or any watering can
  • For all flowers, vegetables, trees, shrubs and houseplants
  • Safe for all plants, guaranteed not to burn when used as directed

9. The Dirty Gardener Nitrogen Fertilizer Urea 46-0-0, 5 Pounds

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Product Features:

  • Great high analysis dry nitrogen for fertilizing crops
  • Pure prilled urea which contains 46% nitrogen
  • Use in areas with adequate water due to tendency to dehydrate the soil
  • Dry granular which spreads well with most fertilizer spreaders
  • Order comes with 5 pounds of urea

10. The Old Farmer’s Almanac Tree & Shrub Fertilizer Spikes (Box of 6 Spikes)

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Product Features:

  • Fast acting, long lasting, robust nutrition feeds trees, evergreens and shrubs
  • 5 Inch TruSpikes are packed with fertilizer. They’re easy to hammer in (no cap required) and will not break, crush or shatter
  • Simple to use. For best results, feed once per season — early spring, and late fall — for continuous fertilization
  • Contains natural ingredients — like molasses — that release nutrition directly into the root zone to help promote stronger trees and shrubs
  • Nutrient rich 13-3-3 formula with 13% Nitrogen for plant growth and color; 3% Phosphorus for healthy fruiting and blooms; and 3% Potassium for strong roots

What to Look for in a Onion Fertilizer

When deciding what onion fertilizer to buy, you need to be sure you’re getting something that will fulfill your needs. Also, give you the most bang for your buck.

You don’t want to get halfway through to realize you purchased the wrong product! So here are some things to consider before you start shopping.

Portability, Comfort, and Convenience

It’s important to keep portability, comfort, and convenience at the top of your mind. Consider how easy it is for you to use or transport. While comfort and convenience aren’t exactly qualities. But that should factor into your decision of which onion fertilizer is best.

There are some products out there that might not be easy to use or comfy enough to use every day. In these cases, you should consider finding an alternative solution.

Also, if your product isn’t convenient enough, chances are you won’t use it as often as you could. And remember: Not using your product at all means it can’t help you meet your goals!

The Material

A good onion fertilizer will use high-quality materials—that are durable, scratch-resistant, and premium. It’s also important that it doesn’t feel cheap. Today, many companies mass produce cheap products designed to look like premium products.

However, while choosing onion fertilizer ensure it is exactly what you want.

Support and Stability

The best products are those that are both stable and supported by manufacturers. Take some time to check what real users say about the item. Also, look up any bugs or glitches on sites like Reddit, Quora. No one likes feeling like they’ve wasted their money on something that has yet to be perfected.

The quality of a product is essential in determining its value. You get what you pay for, so make sure you know about any materials used when researching onion fertilizer.

Brand Value

Regardless of whether you’re looking at your first or next onion fertilizer, find out who’s making it. A quality manufacturer will have solid customer support and a long track record of great products.

Go beyond the price and read reviews. Make sure it’s a product with brand value. You get what you pay for, but not always. Brand-name products are often more expensive because they offer better quality and consistency. However, these higher-quality items can be worth it for their longevity and usability.

The internet is full of products that claim to have amazing results. Double-check any claims with a trustworthy source before making a purchase. And as always, stick with reputable companies and brands for quality products that will work best for you.

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