Best Strawberry Fertilizer (10-5-13): High Potassium for Sweeter, Larger Berries with Slow-Release Feeding Buy on Old Cobblers Farm
Old Cobblers Farm™ Wicked Growth Strawberry Fertilizer 10-5-13
by Wicked Growth — Littleton, NH
13% Potassium for Sweeter Berries
Potassium is the #1 nutrient that determines strawberry sweetness (Brix), berry size, flesh firmness, and how long berries hold after picking. More K = better fruit.
Slow-Release Won't Overpush Runners
Excess quick-release nitrogen triggers aggressive runner production at the expense of fruit. Polymer-coated slow release feeds the crown steadily without the runner explosion.
Calcium Prevents Tip Burn
Gypsum-sourced calcium prevents leaf tip burn and fruit deformity caused by calcium deficiency — common in fast-growing strawberry beds with inconsistent watering.
Per-Plant Precision
1 tablespoon per plant for side-dressing around the crown. One 5 lb bag feeds approximately 160 strawberry plants per application.
500 sq ft at Broadcast Rate
At 1 lb per 100 sq ft, one 5 lb bag covers 500 sq ft of strawberry bed — the best coverage-per-bag ratio for any specialty fruiting formula.
3-Phase Strawberry Program
Feed early spring at growth resumption, again after the main harvest for crown recovery, and at fall renovation for next year's bud set. Three feeds, one product.
All Strawberry Types
June-bearing, everbearing, day-neutral, and alpine strawberries. Works in matted rows, raised beds, containers, hanging baskets, and tower planters.
Trusted by 20,000+ Growers
Developed in Littleton, New Hampshire. Sold nationwide on Amazon, Walmart, eBay, and theoldcobblersfarm.com.
| NPK Ratio | 10-5-13 |
| Derived From | Ammonium Sulphate (14%), Purkote / Polymer Coated Urea (15%), Monoammonium Phosphate (10%), Muriate of Potash (10%), Potassium Magnesium Sulphate (36%), Calcium Sulphate / Gypsum (15%) |
| Item Form | Slow-release granular (polymer coated) |
| Release Speed | Slow-release |
| Application Rate | 1 lb / 100 sq ft (broadcast) | 1 tbsp / plant (side-dress) |
| Method | Broadcast or side-dress around crowns |
| Frequency | 2–3x per season (early spring + post-harvest + fall renovation) |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| Supports | All strawberry varieties — June-bearing, everbearing, day-neutral, alpine strawberries |
| Setups | Strawberry beds, matted rows, raised beds, containers, hanging baskets, tower planters |
| Feature | Old Cobblers Farm™ Wicked Growth Strawberry Fertilizer 10-5-13 | Berry-Tone Organic | Strawberry Part A | Natural Wonder Fruit Tree | Cottonseed Meal | Fruit & Bloom Booster | Fruit & Citrus Spikes | Organic All Purpose | Organic Berry Fertilizer | Potassium Nitrate | Fruit Tree Mix |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 10-5-13 | 4-3-2004 | 8-10-16 | 5-5-2002 | 6-2-2001 | Liquid | 3-5-2005 | 5-5-2005 | Liquid | 13-0-44 | 6-2-2004 |
| Phosphorus | 5.0% | 3.0% | 10.0% | 5.0% | 2.0% | 0.0% | 5.0% | 5.0% | 0.0% | 0.0% | 2.0% |
| Potassium | 13.0% | 4.0% | 16.0% | 2.0% | 1.0% | 0.0% | 5.0% | 5.0% | 0.0% | 44.0% | 4.0% |
| Form | Slow-release granular (polymer coated) | ||||||||||
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb | 4 lb, 18 lb | 2.2 lb | 4 lb, 12 lb | 5 lb, 20 lb | 32 oz | 8 count | 6 lb | 13.5 oz | 10 lb | 5 lb, 25 lb |
| Release Speed | Slow-release |
Berry-Tone Organic
Strawberry Part A
Natural Wonder Fruit Tree
Cottonseed Meal
Fruit & Bloom Booster
Fruit & Citrus Spikes
Organic All Purpose
Organic Berry Fertilizer
Potassium Nitrate
Fruit Tree Mix
13% Potassium for Sweeter Berries
Potassium is the #1 nutrient that determines strawberry sweetness (Brix), berry size, flesh firmness, and how long berries hold after picking. More K = better fruit.
Slow-Release Won't Overpush Runners
Excess quick-release nitrogen triggers aggressive runner production at the expense of fruit. Polymer-coated slow release feeds the crown steadily without the runner explosion.
Calcium Prevents Tip Burn
Gypsum-sourced calcium prevents leaf tip burn and fruit deformity caused by calcium deficiency — common in fast-growing strawberry beds with inconsistent watering.
Per-Plant Precision
1 tablespoon per plant for side-dressing around the crown. One 5 lb bag feeds approximately 160 strawberry plants per application.
