Grow More® Tomato Food 18-18-21 — 1.5 lb Jar

Elevated Potassium and Extra Magnesium Built for a Tomato's Fruiting Demands

Tomatoes carry one of the highest potassium demands of any common garden crop, and a standard balanced fertilizer rarely keeps pace once fruit set begins. Grow More Tomato Food 18-18-21 raises the potassium ratio above a typical all-purpose feed and adds extra magnesium to head off the interveinal chlorosis that heavy-feeding tomato plants commonly develop, especially once high potassium levels start competing with magnesium uptake.

Fully water-soluble, the 1.5 lb jar dissolves for use as a soil drench, through drip irrigation, or as a diluted foliar feed during the vegetative stage, and the formula extends to peppers, eggplants, and other fruiting vegetables that share tomatoes' potassium and magnesium appetite.

Key Features & Benefits

• 18-18-21 NPK Ratio: Balanced nitrogen and phosphorus with elevated potassium, aimed at fruit sizing, firmness, and sugar content.
• Extra Magnesium: Prevents the interveinal chlorosis common in heavy-feeding tomato crops, particularly under high-potassium fertilization.
• Firmer Fruit: Elevated potassium and magnesium support cell-wall integrity, improving shelf life and resistance to cracking.
• Supports Continuous Fruit Set: The balanced ratio with added potassium sustains flower set and fruit development across a full fruiting season.
• Water Soluble: Dissolves cleanly for soil drenching, drip irrigation, or diluted foliar feeding.

Who Should Use This

Home vegetable gardeners, greenhouse growers, and container tomato producers who want a dedicated tomato formula rather than a generic all-purpose feed are the direct fit, especially during fruiting when potassium and magnesium demand peaks. It also suits peppers, eggplants, and cucumbers with similar nutritional needs.

About Grow More Inc.

Founded in 1918 as National Chemical Company in Hollywood, California and now headquartered in Gardena, California, Grow More Inc. manufactures a range of crop-specific formulas, including this dedicated tomato and fruiting-vegetable feed.

Frequently Asked Questions

Why do tomatoes need more potassium than many other crops?

Potassium drives the movement of sugars from leaves to fruit, regulates water uptake, and directly influences fruit size, flavor, and firmness. Inadequate potassium leads to uneven ripening, soft fruit prone to cracking, and reduced yield.

Why is extra magnesium important specifically for tomatoes?

Tomatoes are heavy feeders that deplete soil magnesium quickly, especially in containers or sandy soils, and high potassium fertilization can further compete with magnesium uptake. Supplying extra magnesium alongside potassium keeps the two in balance.

Can I use Tomato Food on other fruiting vegetables?

Yes, the 18-18-21 formula with extra magnesium suits peppers, eggplants, cucumbers, and other fruiting vegetables that share tomatoes' high potassium and magnesium requirements. Apply at the same rate and interval used for tomatoes.

When should I start using Tomato Food during the season?

Begin after transplanting, once plants have established in their final growing position, and continue through the full fruiting season. During heavy fruiting, increase frequency to keep pace with multiple developing fruit clusters.

Does Tomato Food address blossom end rot?

Blossom end rot is primarily a calcium deficiency issue rather than a potassium or magnesium problem. If it's a recurring issue, pair Tomato Food with a dedicated calcium supplement such as a Cal-Mag product.