Home » 11 Best Fertilizer for Onions Reviews in 2021

11 Best Fertilizer for Onions Reviews in 2021

Onions are best grown in the fall. However, many people get impatient and start them early so that they will have onions earlier in the year. This is not a good idea because it can cause your onion crop to be at a higher risk of disease or pest infestation. One thing you need to know about growing onions is that they require a lot of nutrients to grow properly, especially nitrogen. If you want your onion crop to thrive, then make sure you use nitrogen-based fertilizer (ammonium sulfate or ammonium nitrate) when planting your onions!

Top 11 Fertilizer for Onions Reviews

Rank Product Name Score
1
 Burpee Organic Bone Meal Fertilizer
Burpee Organic Bone Meal Fertilizer
9.5
2
 Espoma Garden-Tone Plant Food, Natural & Organic Fertilizer
Espoma Garden-Tone Plant Food, Natural & Organic Fertilizer
9.3
3
 Jobe's Organics Vegetable & Onion Fertilizer Spikes
Jobe's Organics Vegetable & Onion Fertilizer Spikes
9.2
4
 Dr. Earth Premium Gold All Purpose Fertilizer
Dr. Earth Premium Gold All Purpose Fertilizer
9.2
5
 MasterBlend 4-18-38 Onion & Vegetable Fertilizer
MasterBlend 4-18-38 Onion & Vegetable Fertilizer
9.1
6
 Dr. Earth Organic 5 Onion, Vegetable & Herb Fertilizer
Dr. Earth Organic 5 Onion, Vegetable & Herb Fertilizer
9.1
7
 Miracle-Gro Water Soluble Plant Food Vegetables & Herbs
Miracle-Gro Water Soluble Plant Food Vegetables & Herbs
9
8
 Miracle-Gro Water Soluble All Purpose Plant Food
Miracle-Gro Water Soluble All Purpose Plant Food
9
9
 Espoma BT4 4-Pound Bulb-tone 3-5-3 Plant Food
Espoma BT4 4-Pound Bulb-tone 3-5-3 Plant Food
8.7
10
 Fox Farm 6-4-4, 1-Pint FX14092 Grow Big Liquid Concentrate Fertilizer
Fox Farm 6-4-4, 1-Pint FX14092 Grow Big Liquid Concentrate Fertilizer
8.5
11
 Jobe's Organics Bone Meal Fertilizer
Jobe's Organics Bone Meal Fertilizer
8

1. Burpee Organic Bone Meal Fertilizer

1
9.5/10 our score
  • 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.

2. Espoma Garden-Tone Plant Food, Natural & Organic Fertilizer

2
9.3/10 our score
  • FOR USE ON: Use Garden-tone organic fertilizer for leafy vegetables like lettuce, kale & cabbage as well as warm season crops like tomatoes, peppers, squash & melons.
  • CONTAINS: Garden-tone is a rich blend of the finest natural & organic ingredients enhanced with our exclusive Bio-tone formula; 3-4-4 Fertilizer analysis with 5% calcium. Garden-tone is environmentally Safe - No sludges or toxic ingredients.
  • WHEN / HOW TO USE: Use Garden-tone fertilizer monthly throughout the growing season. Apply to the soil around the drip line of the plant or on either side of planting rows and then water thoroughly. Garden-tone is ready to use and requires no mixing.
  • FOR ORGANIC GARDENING: Garden-tone is approved for organic gardening; It is a registered Organic Input Material meaning it meets all requirements for organic production.
  • MADE IN THE USA: Product of the Espoma Company. The leader in natural organics since 1929.

3. Jobe's Organics Vegetable & Onion Fertilizer Spikes

3
9.2/10 our score
  • Organic fertilizer spikes; Time release fertilizer; Pre-measured to provide plants with nourishment at their roots
  • OMRI listed for organic gardening by USDA; Certified organic means no synthetic chemicals
  • Contains Jobe’s Biozome…the proprietary microorganism archaea that aggressively breaks down material for faster results
  • Jobe’s Biozome improves soil conditions, helps resist disease, insects, and drought during the growing season
  • No mess easy to use spikes; Prevents waste and run-off; Guaranteed analysis: (2-7-4) 50 spikes in resealable bag

4. Dr. Earth Premium Gold All Purpose Fertilizer

4
9.2/10 our score
  • The only Non-GMO Project Verified fertilizer in the U.S.A.
  • People & Pet Safe - no synthetic chemicals, GMO infested chicken manure or toxic ingredients.
  • Handcrafted from human and feed grade ingredients. Enriched with multi-minerals, proteins, carbohydrates, humic acids & trace elements that promote the healthiest soils capable of growing the healthiest fruits and vegetables for your family.
  • Organic Transparency; OMRI (Organic Material Review Institute), OIM (Organic Input Materials), CCOF (California Certified Organic Farmers), NOP (National Organic Program) and Non-GMO Project Verified the highest level of purity and transparency.
  • Sustainably made in the U.S.A. through a collaboration of high level enviornmentalists inspired to positively change the world. Formulated by Milo Shammas, founder of Dr. Earth, to grow Home Grown Foods.

5. MasterBlend 4-18-38 Onion & Vegetable Fertilizer

5
9.1/10 our score
  • MasterBlend 4-18-38 Fertilizer in Bulk
  • Choose 1, 5, or 25 Pound Quantities
  • MasterBlend World renowned Hydroponic Vegetable Fertilizer for Peppers and Tomatoes!
  • Super concentrated and easy to use!
  • MasterBlend is 100% water soluble, and contains all the trace minerals needed!

6. Dr. Earth Organic 5 Onion, Vegetable & Herb Fertilizer

6
9.1/10 our score
  • 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

7. Miracle-Gro Water Soluble Plant Food Vegetables & Herbs

7
9/10 our score
  • Miracle-Gro Water Soluble Plant Food Vegetables and Herbs includes natural ingredients
  • Feeds instantly to promote big and beautiful results (vs unfed)
  • Use Miracle-Gro soil plus plant food for even more harvest (vs unfed)
  • Apply with a watering can or Miracle-Gro Garden Feeder
  • Miracle-Gro Water Soluble Plant Food Vegetables and Herbs is great for tomatoes, squash, peppers, cucumber, carrots, basil and other herbs and vegetables

8. Miracle-Gro Water Soluble All Purpose Plant Food

8
9/10 our score
  • 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. Espoma BT4 4-Pound Bulb-tone 3-5-3 Plant Food

9
8.7/10 our score
  • FOR USE ON: Use Bulb-tone organic fertilizer for all Spring bulbs like tulips, daffodils, crocus & hyacinths and on Spring bulbs like gladioli and lilies
  • CONTAINS: Bulb-tone is a rich blend of the finest natural & organic ingredients enhanced with our exclusive Bio-tone formula; 3-5-3 Fertilizer analysis with 6% Calcium. Bulb-tone is environmentally Safe - No sludges or toxic ingredients
  • WHEN / HOW TO USE: Best to use Bulb-tone fertilizer when planting or feeding post bloom on spring flowering bulbs; place directly in the planting hole for new bulbs and sprinkle on the soil surface for established plants then water thoroughly. Bulb-tone is ready to use and requires no mixing
  • FOR ORGANIC GARDENING: Bulb-tone is approved for organic gardening; It is a registered Organic Input Material meaning it meets all requirements for organic production
  • MADE IN THE USA: Product of the Espoma Company. The leader in natural organics since 1929

10. Fox Farm 6-4-4, 1-Pint FX14092 Grow Big Liquid Concentrate Fertilizer

10
8.5/10 our score
  • Get your garden going with grow big, Foxfarm's liquid concentrate fertilizer for lush vegetative growth.
  • Grow big contains earthworm castings, Norwegian kelp and essential micronutrients. Foxfarm's special brew is designed to enhance plant Size and structure, allowing for more abundant fruit, flower and bud development.
  • Garden tip: allow new plantings a few days to settle in, then begin using at the rate of two teaspoons per gallon of water every other time you water. You can also use grow big for foliar feeding, applying to both sides of leaves, preferably early in the morning. At the first sign of flowering, switch to one of foxfarm’s blooming fertilizers. For best results, refer to the FoxFarm feeding schedule.
  • Country Of Origin: United States

11. Jobe's Organics Bone Meal Fertilizer

11
8/10 our score
  • Organic granular fertilizer vegetables, tubers, flowers and bulbs; Excellent source of phosphorus and calcium
  • OMRI listed for organic gardening by USDA; Certified organic means no synthetic chemicals
  • 2% Nitrogen, 14% phosphate, and 15% calcium; Promotes sturdy root systems and stimulates healthier fruits and blooms
  • Granulated “prilled” form reduces dust during application and is perfect for all types of fertilizer spreaders
  • Easy pour bag; Guaranteed fertilizer analysis: (2-14-0) 4 pound bag; Apply every 3 months

Last update on 2022-05-20 / Affiliate links / Images from Amazon Product Advertising API

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