1、9 Tips for Fertilizing Your Ornamental Onion

Foliar feeding can give your Ornamental Onions a quick nutrient boost: Mix a foliar fertilizer, like fish emulsion, as per the instructions for a proper dilution. Apply the mixture to the leaves of the plants during the cooler parts of the day to prevent evaporation and leaf burn.

2、8 Best Fertilizers For Onions – Reviews & Top Picks in 2026

Unlock the secrets to successful onion growing with the 8 best fertilizers for onions to nourish them during key growth stages.

3、Best Fertilizers for Onions: Top 10 Homemade and Organic Picks from

In this guide, I’ll share the best homemade and organic fertilizers, explain exactly when to use them, and give you a simple feeding schedule to keep your crop thriving. Onions are heavy feeders because they grow quickly and must build both leafy tops and fleshy bulbs in a short window.

4、Guide to Fertilizing Your Green Onion Plant

When choosing a fertilizer for your green onion plant, look for a balanced fertilizer with equal amounts of nitrogen, phosphorus, and potassium (NPK). Additionally, choose a fertilizer with a higher nitrogen content as this will promote healthy leaf growth.

5、Fertilizing onions: expert tips to get bigger crops

Discover how to get the best regime for fertilizing onions, including the best fertilizers and the best timings for the biggest bulbs

Choosing the Best Organic Fertilizer for Onions: A Gardener’s Guide

One crucial aspect of cultivating healthy, robust onions is selecting the right fertilizer to nourish your plants. In this guide, we’ll explore the benefits of using organic fertilizers, compare various options available, and provide tips on how to properly apply them to your onion crops.

7 Best Onion Fertilizers for 2026

It can be a little overwhelming when trying to choose the best onion fertilizer. Here is our full guide to fertilizing onions with a few helpful growing tips.

How to Fertilize Onions Plants

Onions thrive in soil that is rich in nutrients, particularly nitrogen, which encourages leafy growth and strong bulb development. Look for a balanced fertilizer with an NPK ratio such as 10-10-10, or opt for one that is slightly higher in nitrogen, like 16-6-4.

Onion Growth Fertilizer Plan: Fertilization Schedule

Foliar feeds and liquid fertilizers, made from natural substances like fish emulsion and humic acid, are effective in providing nutrients to onions, supplementing soil, and enhancing their uptake by roots and leaves, as well as enhancing their nutritional value.

The influence of potassium nanoparticles as a foliar fertilizer on

Spraying onion plants with K-NPs (200 mg/l) significantly improved the vegetative characteristics of onion plant growth and production, as well as increasing the plant pigments and the content of carbohydrate, oil, total indole, and phosphorus in onion bulbs.

Green onions, as a common vegetable, require high nutrient levels during their growth. Selecting appropriate foliar fertilizers can effectively promote their growth and increase yields. Below is an introduction to several suitable foliar fertilizers for green onions and their application methods:

1. Potassium Dihydrogen Phosphate (KH₂PO₄) Foliar Fertilizer

1. Main Components: Potassium dihydrogen phosphate is a common nutrient fertilizer containing phosphorus (P) and potassium (K), both essential for plant growth.
2. Mechanism of Action: It provides phosphorus and potassium, enhancing nutrient absorption, root development, and stress resistance. It also boosts protein synthesis, strengthens immunity, and reduces disease incidence.
3. Application Recommendation: Spray every 7–10 days during the early and mid-growth stages, using 500–1,000 ml per acre per application. Excessive use may lead to overly rapid growth and compromised quality.

2. Potassium Algininate Foliar Fertilizer

1. Main Components: Rich in minerals like calcium (Ca) and magnesium (Mg), this fertilizer supplements micronutrients.
2. Mechanism of Action: Increases cellular osmotic pressure, improves water and nutrient absorption, enhances drought and disease resistance, and boosts photosynthetic efficiency.
3. Application Recommendation: Spray every 10–14 days during the late growth stage, using 500–1,000 ml per acre per application. Overuse may disrupt physiological balance.

3. Amino Acid-Based Complex Foliar Fertilizer

1. Main Components: Contains multiple amino acids that regulate plant growth.
2. Mechanism of Action: Enhances enzyme activity, accelerates nutrient synthesis/transport, improves stress resistance, and helps plants adapt to adverse conditions.
3. Application Recommendation: Spray every 10–14 days during the mid-to-late growth stages, using 500–1,000 ml per acre per application. Excessive use may cause growth imbalance.

4. Humic Acid Foliar Fertilizer

1. Main Components: Humic acid, a natural organic matter rich in humic substances and trace elements.
2. Mechanism of Action: Improves soil structure, enhances water/nutrient retention, stimulates microbial activity, and promotes root development.
3. Application Recommendation: Spray every 7–10 days during the early and mid-growth stages, using 500–1,000 ml per acre per application. Overuse may disrupt soil pH balance.

5. Microelement Foliar Fertilizer

1. Main Components: Includes iron (Fe), zinc (Zn), boron (B), and other trace elements critical for plant growth.
2. Mechanism of Action: Rapidly replenishes micronutrients, supports hormone synthesis, and enhances stress resistance.
3. Application Recommendation: Spray every 7–10 days during the mid-to-late growth stages, using 500–1,000 ml per acre per application. Excessive use may cause growth imbalance.

Selecting the right foliar fertilizer is crucial for green onion growth. Consider growth stages, soil conditions, and local climate to maximize effectiveness. Avoid overapplication to prevent imbalances. With proper fertilization, green onions will thrive and deliver delicious results.