Using Epsom Salts on Tomatoes: Frequency and City Water Concerns

Epsom Salt Spray Schedule for Tomato Plants

Epsom salts (magnesium sulfate) can benefit tomato plants by improving nutrient uptake, particularly calcium, which helps prevent blossom-end rot. But timing and dilution matter.

Recommended Application

Spray tomato plants (and roses) every 10–12 days during the growing season. Dissolve 3 teaspoons of Epsom salts per gallon of water and apply generously to foliage until runoff occurs. This foliar feeding delivers magnesium directly to leaves for quick absorption.

Why It Works

Magnesium enhances root efficiency in absorbing hard-to-access nutrients like calcium. On tomatoes, this often prevents the black, sunken bottoms characteristic of blossom-end rot on early fruit.

Dealing with City Water Chemicals

If you're concerned about chlorine or other additives in municipal water (like in Norfolk, VA), two simple methods help:

• Rainwater collection: Place barrels under downspouts to capture free, chemical-free water.
• Aging tap water: Fill 5-gallon buckets and let them sit uncovered for 3+ days. Most volatile chemicals dissipate naturally.

Both approaches give your plants cleaner water without expensive filtration systems.

Quick Reference

Task	Details
Epsom salt spray	3 tsp/gallon, every 10–12 days
Rainwater collection	Barrels under downspouts
Tap water aging	5-gallon buckets, 3+ days uncovered

Consistent magnesium supplementation and cleaner water contribute to healthier, more productive tomato plants.