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

Water-Soluble Tomato Fertilizer with Extra Magnesium and High Potassium for Firmer Fruit and Better Yields

Grow More® Tomato Food 18-18-21 is a specially formulated water-soluble fertilizer designed to meet the demanding nutritional requirements of tomatoes and other fruiting vegetables. With a higher potassium ratio than standard balanced fertilizers, extra magnesium to prevent the blossom-end chlorosis and yellowing that commonly afflicts tomatoes, and a 18-18-21 NPK profile that supports the complete vegetative and productive growth cycle, Tomato Food delivers the targeted nutrition that serious tomato growers rely on for bigger harvests and better-quality fruit.

Key Features & Benefits

• 18-18-21 NPK Ratio: Balanced nitrogen and phosphorus with elevated potassium — the higher potassium level is critical for fruit sizing, skin firmness, sugar content, and overall fruit quality in tomatoes and other fruiting crops.
• Extra Magnesium: Magnesium deficiency is extremely common in heavy-feeding tomato crops, causing interveinal chlorosis on older leaves that progressively weakens the plant. The extra magnesium in Tomato Food prevents this deficiency and supports vigorous chlorophyll production throughout the season.
• Firmer Fruit: The elevated potassium and magnesium levels directly contribute to improved cell wall integrity in developing fruit, resulting in firmer tomatoes with better shelf life and resistance to cracking and splitting.
• Better Yields: The balanced NPK with elevated K supports continuous flower set and fruit development across the full fruiting season, helping plants produce larger quantities of high-quality fruit per plant.
• Water Soluble: Fully dissolves for clean application as a soil drench, in drip irrigation systems, or as a diluted foliar feed during the vegetative phase.

Who Should Use This

Grow More Tomato Food is ideal for home vegetable gardeners, greenhouse growers, and container tomato producers who want a dedicated, precision tomato fertilizer rather than a generic all-purpose product. It is particularly valuable during the fruiting phase when potassium and magnesium demands peak, and for growers who have experienced magnesium deficiency or poor fruit quality in previous seasons.

Compatibility

Apply as a dissolved soil drench around the base of tomato plants, or dilute and inject into drip irrigation systems at the recommended rate. Can also be used as a diluted foliar feed during the vegetative growth stage. Compatible with other water-soluble fertilizers and can be used alongside calcium supplements when blossom end rot is a concern. Suitable for tomatoes, peppers, eggplants, and other fruiting vegetable crops.

Frequently Asked Questions

Why do tomatoes need more potassium than many other crops?

Tomatoes have one of the highest potassium demands of any common garden crop. Potassium drives the movement of sugars from leaves to fruit (phloem loading), regulates water uptake and stomatal function, and directly influences fruit size, flavor, and firmness. Inadequate potassium results in uneven ripening, poor flavor, soft fruit susceptible to cracking, and reduced yield.

Why is extra magnesium important specifically for tomatoes?

Tomatoes are particularly susceptible to magnesium deficiency because they are heavy feeders that quickly deplete soil magnesium reserves, especially in containers or when grown in sandy soils. Additionally, high potassium levels in the soil (from heavy fertilization) can compete with magnesium uptake — making it even more important to supply magnesium alongside potassium in a tomato feeding program.

Can I use Tomato Food for other vegetables and fruiting crops?

Yes. The 18-18-21 formula with extra magnesium is well suited to peppers, eggplants, cucumbers, and other fruiting vegetables that share the tomato’s high potassium and magnesium requirements during fruit development.

When should I start using Tomato Food during the growing season?

Begin applying Tomato Food after transplanting, once plants have established in their final growing position. Continue through the entire fruiting season. During heavy fruiting, increase application frequency to ensure adequate potassium supply to meet the demands of multiple simultaneously developing fruit clusters.

Does Tomato Food address blossom end rot?

Blossom end rot in tomatoes is primarily a calcium deficiency disorder, not a potassium or magnesium issue. While Tomato Food’s extra magnesium and balanced nutrition support overall plant health, if blossom end rot is a recurring problem, additional calcium supplementation (such as a dedicated Cal-Mag or calcium nitrate product) applied alongside Tomato Food may be needed.