How often should I water tomato plants?
Written by
Julia Anderson
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Watering tomatoes calls for precision to some extent. Deep watering 2-3 times a week will develop deep roots that can resist drought. I have a meter for measuring moisture in soil, I stick it in 4 inches down. If it is a 5 or below, I water slowly at their base just until you see it pool up a little. Containers dry much faster than in the ground. When it is hot, you should check them daily.
Container Care
- Pot size: Use 5-gallon+ containers for stable moisture
- Drainage: Add perlite to prevent soggy roots
- Mulch: Layer straw to reduce evaporation
Disease Prevention
- Avoid overhead watering: Triggers fungal spores
- Morning irrigation: Lets leaves dry by noon
- Drip systems: Target roots without wetting foliage
Consistency prevents blossom-end rot. When we had temperatures of 100 degrees, I used my drip system, which delivered 1/2 gallon of water daily to each plant. Use shredded leaves for mulch, as they help to regulate soil temperatures better than plastic does. Cracked fruits are often a sign of hit-or-miss watering, so if you have trouble remembering to water, consider using a calendar app.
Summer Heat
- Increase frequency: Add 25% more water
- Shade cloth: 30% coverage from 11am-3pm
- Foliar spray: Mist lightly at dawn (optional)
Spring Rains
- Reduce irrigation: Track weekly rainfall
- Raised beds: Improve drainage in clay soils
- Cover seedlings: Use cloches during downpours
Carefully watch your plants every hour during your experimental routine. My ‘Early Girl' tomatoes wilt just a bit in the heat of the midday sun. This is normal. Permanent wilting of many plants after sunset, however, is a sign of thirst. Always keep the balance in mind. An overwatered plant attracts aphids. An under-watered plant promotes stunted growth. Your harvest will certainly show your attention!
Read the full article: How to Grow Tomatoes: Complete Beginner's Guide
