To speed ripening late in the season, remove the growing tip of each main stem about four weeks before the first expected fall frost. Called "topping," this type of pruning causes the plant to stop flowering and setting new fruit, and instead directs all sugars to the remaining fruit.
Cutting the tips of tomato vines stops the growth on that vine. This process of "topping" tomatoes can increase tomato production and provide control over plant growth. Commonly done at the end of the growing season, simple pinching and pruning is all it takes to top tomatoes and improve tomato harvests. (Vid.
You can keep tomato plants from growing too tall by regularly pruning them, providing support such as stakes or cages, and ensuring they receive adequate sunlight and nutrients to encourage healthy growth without excessive stretching.
From a plant disease perspective it's not too advisable to top your tomato plants. pulling off flowers and suckers are more advisable because you are not creating large wounds.
You can actually create new tomato plants with these clippings! Simply throw them into a glass of water or a soil medium for a week or two, then they'll be ready to be transplanted. However, since it's going to freeze in a month or so, it doesn't make sense to transplant these outdoors.
In late summer, cordon varieties should have the main stem 'stopped' (cut off) to avoid wasting energy on the production of late fruit that won't have time to develop. Let four fruit trusses form on outside plants (six on indoor plants), then pinch out the growing tip.
Most grow to three or four feet tall, although some patio varieties top out at 12 inches. Indeterminate tomato plants, which tend to vine, require trellising or cages, continue to grow, and produce fruit until the first frost.
However, tomato plants can be a bit finicky when it comes to getting too close to their tomato neighbors, and they like a bit of space between themselves and their fellow garden companions.
With large-fruited tomato varieties such as ox-heart and beef tomatoes, however, the side shoots should be removed. Even with medium-sized indeterminate tomatoes, we recommend only leaving a maximum of two to three shoots, including the main shoot.
If tomatoes are not pruned early enough in their growth, they will grow tall with lots of leaves and flowers at the top, but no growth on the lower stems.
Aim to prune plants when the suckers are between 2 and 4 inches long. Determinate tomato plants (those that reach 4 feet tall or so and stop growing) only need to be pruned once. Indeterminate tomatoes can be pruned every couple of weeks as they continue to produce new leaves.
To speed ripening late in the season, remove the growing tip of each main stem about four weeks before the first expected fall frost. Called "topping," this type of pruning causes the plant to stop flowering and setting new fruit, and instead directs all sugars to the remaining fruit.
Water correctly: Do not overwater. The first week tomato plants are in the ground, they need water every day, but back off watering after the first week, slowly weaning the plants down to 1 to 1.5 inches of water per week.
There are some who advocate hilling up around tomato plants, beginning as soon as they are a few inches high, and continuing the practice until the plant appears to emerge from the center of a hillock a foot or so high.
Tomato plants require a good amount of these resources, so if they're planted closely together, they will compete and likely all lose. Low Production – Even if tomato plants growing closely together survive, they may not produce as many tomatoes as they could have if properly spaced.
Plants will roll or cup leaves to reduce surface area and maintain the moisture in their leaves. Leaf rolling or cupping is a very common behavior in corn and tomato plants in response to heat stress.
In general, determinate tomatoes tend to do better in pots, so look for those. It's also possible to grow indeterminate tomatoes in containers, of course, as long as you provide enough support and soil volume.
Tomatoes love the sunshine. A position in full sun (that means an average of at least eight hours a day) gives the best results in most areas, though if you're in a hot climate you can get away with dappled shade.
Generally, animal dung from non-industrial farms is the most popular organic fertilizer used in tomato cultivation — cow, horse, and sheep-goat manures work best.
If space in your garden is at a premium, or if you're supporting plants with tomato ladders or stakes, it's best to prune your tomato plants to one or two main stems. To do this, pinch out all suckers. Otherwise, suckers will grow into additional stems and create a wide, bushy plant.