Best Tomato Fertilizer (10-5-13): Polymer-Coated Slow Release with Calcium to Prevent Blossom End Rot Buy on Old Cobblers Farm
Old Cobblers Farm™ Wicked Growth Tomato Fertilizer 10-5-13
by Wicked Growth — Littleton, NH
Stops Blossom End Rot at the Source
Calcium sulphate (gypsum) delivers plant-available calcium directly to the root zone. Consistent calcium uptake prevents the black, sunken fruit bottoms that ruin harvests.
Polymer-Coated Slow Release
Purkote-coated urea releases nitrogen gradually over weeks. No surge-and-crash feeding cycle — steady nutrition from transplant through final harvest.
13% Potassium for Flavor & Firmness
Potassium drives sugar accumulation (Brix), enhances red color development, improves flesh firmness, and extends shelf life. The difference between a mediocre tomato and a great one.
Sulfur & Magnesium Built In
Langbeinite provides magnesium for chlorophyll production and sulfur for protein synthesis and flavor compound development. No separate amendments needed.
Per-Plant Dosing
1.5 tablespoons per plant for side-dressing — simple and precise. One 5 lb bag feeds approximately 53 tomato plants per application.
6-Ingredient Professional Blend
Six precision ingredients deliver three primary nutrients plus three secondary nutrients in a single slow-release granule. No other tomato fertilizer packs this much into one product.
All Tomato Types & Setups
Beefsteak, cherry, roma, heirloom, grape — determinate or indeterminate. Works in beds, raised beds, containers, grow bags, and high tunnels.
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 | 2–3 lbs / 100 sq ft (broadcast) | 1.5 tbsp / plant (side-dress) |
| Method | Broadcast, side-dress, or band at plant base |
| Frequency | 2–3x per season (transplant + flowering + fruiting) |
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb |
| Supports | All tomatoes — beefsteak, cherry, roma, heirloom, grape, plum, determinate, indeterminate |
| Setups | Garden beds, raised beds, containers, grow bags, field rows, high tunnels |
| Feature | Old Cobblers Farm™ Wicked Growth Tomato Fertilizer 10-5-13 | Tomato-Tone Organic | Home Grown Tomato/Veg | Water Soluble Tomato | Tomato & Vegetable | Vegetable & Tomato Food | Tomato & Vegetable Food | Organics Vegetable/Tomato | Smart-Release Flower/Veg | Tomato & Vegetable Nutrients | Tomato & Vegetable Food |
|---|---|---|---|---|---|---|---|---|---|---|---|
| NPK | 10-5-13 | 3-4-2006 | 4-6-2003 | 18-18-21 | 3-6-2006 | 2-5-2003 | 12-10-2005 | 3-4-2004 | 14-14-14 | 4-18-38 | 4-5-2006 |
| Phosphorus | 5.0% | 4.0% | 6.0% | 18.0% | 6.0% | 5.0% | 10.0% | 4.0% | 14.0% | 18.0% | 5.0% |
| Potassium | 13.0% | 6.0% | 3.0% | 21.0% | 6.0% | 3.0% | 5.0% | 4.0% | 14.0% | 38.0% | 6.0% |
| Form | Slow-release granular (polymer coated) | ||||||||||
| Sizes | 5 lb | 10 lb | 15 lb | 20 lb | 4 lb, 18 lb | 4 lb, 12 lb | 1.5 lb, 3 lb | 4 lb | 4 lb, 16 lb | 4 lb | 4 lb, 8 lb | 4.5 lb, 8 lb | 5 lb | 4 lb, 8 lb |
| Release Speed | Slow-release |
Tomato-Tone Organic
Home Grown Tomato/Veg
Water Soluble Tomato
Tomato & Vegetable
Vegetable & Tomato Food
Tomato & Vegetable Food
Organics Vegetable/Tomato
Smart-Release Flower/Veg
Tomato & Vegetable Nutrients
Tomato & Vegetable Food
Stops Blossom End Rot at the Source
Calcium sulphate (gypsum) delivers plant-available calcium directly to the root zone. Consistent calcium uptake prevents the black, sunken fruit bottoms that ruin harvests.
Polymer-Coated Slow Release
Purkote-coated urea releases nitrogen gradually over weeks. No surge-and-crash feeding cycle — steady nutrition from transplant through final harvest.
13% Potassium for Flavor & Firmness
Potassium drives sugar accumulation (Brix), enhances red color development, improves flesh firmness, and extends shelf life. The difference between a mediocre tomato and a great one.
Sulfur & Magnesium Built In
Langbeinite provides magnesium for chlorophyll production and sulfur for protein synthesis and flavor compound development. No separate amendments needed.
