Best Garlic & Onion Fertilizer (10-10-10): Balanced Nutrition for Bigger Bulbs, Stronger Flavor & Clean Curing Buy on Old Cobblers Farm
Old Cobblers Farm™ Wicked Growth Garlic + Onion Fertilizer
by Wicked Growth — Littleton, NH
Aligned to Allium Growth Cycle
Garlic and onions grow in distinct phases: fall rooting, spring leaf expansion, then bulb formation. This formula feeds the first two phases and steps back for the third — exactly how alliums want to eat.
More Leaves = Bigger Bulbs
Each garlic leaf corresponds to one bulb wrapper. More leaves = more wrappers = bigger, better-protected bulbs. 10% nitrogen fuels the leaf growth that directly determines bulb size.
Balanced P & K for Root & Bulb
10% phosphorus supports fall root establishment. 10% potassium strengthens bulb tissue quality, improves flavor compound development, and extends storage life.
Stop 2–3 Weeks Before Harvest
Critical: cease feeding 2–3 weeks before harvest. Continued nitrogen delays maturity and produces wet bulbs that won't cure properly for long-term storage.
110–220 sq ft Per Bag
At ½–1 cup per 10 sq ft, one 5 lb bag covers 110–220 sq ft of garlic or onion bed at planting. Side-dress uses the lighter rate.
Simple 2-Feed Program
Feed at fall planting (or early spring for onions), then side-dress once in mid-spring when growth resumes. Two applications and you're done.
All Allium Types
Hardneck garlic, softneck garlic, elephant garlic, onions, shallots, leeks, scallions, and chives — the entire allium family thrives on balanced feeding.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 10-10-10 |
| Derived From | Urea (10–20%), Diammonium Phosphate (10–20%), Potassium Chloride / Muriate of Potash (40–50%), Silicon Dioxide (4–53%) |
| Item Form | Granular |
| Release Speed | Moderate-release |
| Application Rate | ½–1 cup / 10 sq ft (pre-plant) | ½ cup / 10 sq ft (side-dress) |
| Method | Incorporate at planting, side-dress in spring |
| Frequency | 2x per season (fall planting + spring side-dress) |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| Supports | All garlic (hardneck, softneck, elephant), onions, shallots, leeks, scallions, chives |
| Setups | Garden beds, raised beds, containers, field rows |
| Feature | Old Cobblers Farm™ Wicked Growth Garlic + Onion Fertilizer | Multi-Purpose 10-10-10 | Granular with Micros | All Purpose Fertilizer | Tomato & Vegetable | WonderFert All-Purpose | Multi-Purpose Organic | Organic Enriched Veg | Vegetable Food | 10-10-10 All Purpose | 10-10-10 All-Purpose |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 10-10-10 | 10-10-10 | 10-10-10 | 10-10-10 | 4-18-38 | 10-2-2006 | 6-2-2004 | 7-7-2007 | 10-10-10 | 10-10-10 | 10-10-10 |
| Phosphorus | 10.0% | 10.0% | 10.0% | 10.0% | 18.0% | 2.0% | 2.0% | 7.0% | 10.0% | 10.0% | 10.0% |
| Potassium | 10.0% | 10.0% | 10.0% | 10.0% | 38.0% | 6.0% | 4.0% | 7.0% | 10.0% | 10.0% | 10.0% |
| Form | Granular | ||||||||||
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb | 33 lb | 10 lb | 40 lb | 5 lb | 32 oz | 7 lb | 4 lb | 40 lb | 40 lb | 5 lb |
| Release Speed | Moderate-release |
Multi-Purpose 10-10-10
Granular with Micros
All Purpose Fertilizer
Tomato & Vegetable
WonderFert All-Purpose
Multi-Purpose Organic
Organic Enriched Veg
Vegetable Food
10-10-10 All Purpose
10-10-10 All-Purpose
Aligned to Allium Growth Cycle
Garlic and onions grow in distinct phases: fall rooting, spring leaf expansion, then bulb formation. This formula feeds the first two phases and steps back for the third — exactly how alliums want to eat.
More Leaves = Bigger Bulbs
Each garlic leaf corresponds to one bulb wrapper. More leaves = more wrappers = bigger, better-protected bulbs. 10% nitrogen fuels the leaf growth that directly determines bulb size.
Balanced P & K for Root & Bulb
10% phosphorus supports fall root establishment. 10% potassium strengthens bulb tissue quality, improves flavor compound development, and extends storage life.
Stop 2–3 Weeks Before Harvest
Critical: cease feeding 2–3 weeks before harvest. Continued nitrogen delays maturity and produces wet bulbs that won't cure properly for long-term storage.
