The hotter and drier it is, the more often your tomato plants will need to be watered. In extreme heat, tomatoes in containers will need to be watered daily. If it's dry on top of the heat, then you may need to increase it to twice daily.
Remember that pots dry out quickly. Water potted tomato plants daily at the soil level. You'll know you've watered enough when the water trickles through the pot's drainage holes. A mature tomato plant in a pot uses a gallon of water daily but you may need to hydrate the plant twice a day in hot, dry conditions.
You certainly can! Overwatering can kill the plant, crack both the stem and the fruit. That will attract all different kinds of bad insects and diseases. When the soil is dry to the first joint of your finger, it's time to water. You should also water in the morning, as sun on water drops can cause damage.
Tomatoes like water, so keep the soil slightly damp. If the top inch or so is completely dry about 1.5 inches a week should be about right in most cases. We get enough water in New England, that once established, I rarely water.
Overwatering generally makes the plant look almost like it's rotting, as in drooping and turning soggy brown. My guess is it is having Nitrogen problems. Any type of vegetable fertilizer you buy at the store should work fine.
Tomatoes thrive in loamy soils with good drainage and high organic matter content. Adding composted coffee grounds to planting beds is a great way to build healthy soil for tomato planting but won't provide all the required nutrients.
Avoid Overwatering Tomatoes in Summer Weather
Tomato plants need an inch or two of water a week, and a deep soaking is better than a little water every day.
Overwatering tomatoes can lead to yellow and spotted leaves, while underwatering results in wilt and diseased fruit.
The good news is that most plants will bounce back between 7-14 days if they're given proper care (which includes rehydration). If this isn't possible because major damage was done or little healthy root system exists then expect about 2 weeks until improvement can be seen.
"Only water your plants in the early mornings or late evenings."
Vine crops are heavy water feeders, so you should constantly check soil moisture. Cucumbers need about one inch of water from rainfall or irrigation each week during the growing season. Always soak the soil thoroughly when watering. Water sandy soils more often, but with lower amounts applied at any one time.
Soil that contains a lot of sand doesn't hold water well and dries quickly. Because of this, tomato plants growing in sandy soil may need to be watered more often, about every three or four days. Clay soil, on the other hand, holds water well. Plants growing in clay soil usually only need to be watered once a week.
Tomatoes, like most plants, hate to get totally dry or sit in soggy soil. These containers solve both problems — like Goldilocks' porridge, the soil is just right. Self watering containers are available at garden centers everywhere, but they are not cheap.
Single Planting: Planting one tomato plant per 5-gallon bucket is typically the simplest method. This ensures plants have enough space and nutrients to grow and are easier to manage. Double Planting: If you wish to increase yield in limited space, consider planting two tomato plants per 5-gallon bucket.
Deep watering entails watering at a slow pace for long enough that the water soaks deep into the soil, where the roots are. Often this means watering for 30-60 minutes at a time, 2-3 times each week, until plants are established.
Sunscald. Tomato plants protect their fruit with an umbrella of leaves. In bright, hot weather, fruit exposed to the sun may develop a scalded, or sunburned, spot. This is most common on green fruit.
Tomato plants recover quickly from overwatering, usually in one to two weeks with treatment. How often should you water tomatoes? In the garden, water tomato plants deeply at the soil level once a week or twice weekly during hot weather depending on rainfall.
Tomatoes should stay in consistently moist soil, but the soil should not get soggy. You will likely need to water every day, but if it has rained heavily in the past 24 hours, it may not be necessary. A good idea is to plan to water every day but to do a visual check first.
Drip irrigation has emerged as one of the most efficient methods for irrigating tomatoes.
The eggshells will naturally decompose, and they will add calcium and nitrogen to your soil; necessary nutrients for your plants. Calcium is very good for tomatoes because it prevents blossom end rot.
Coffee grounds can most certainly be added to your compost and also directly to your soil. Instead of simply tossing them out though, you may wish to incorporate them a bit more thoroughly by digging them in.
Banana peels are also brimming with potassium, which is excellent for plants like tomatoes, peppers or flowers. “Banana peels also contain calcium, which prevents blossom end rot in tomatoes,” the Cape Gazette adds.