To stop tomato plants from growing too tall, use the "topping" method: cut off the main growing tip of the plant about 30 to 40 days before your region's first expected fall frost, or when it reaches the top of your trellis or cage. This redirects energy into ripening existing fruit.
Cutting the top off a tomato plant stops vertical growth and forces the plant to redirect its energy into maturing existing fruit rather than producing new foliage. However, the exact outcome depends on whether it's done intentionally at the end of the growing season or by accident.
Photo by Julie Martens Forney. To do the Missouri pruning technique on suckers, pinch off the growing tip, leaving only the two lowest leaves. To help improve airflow and cut down on the chance of disease, remove the leaves along the bottom 12 inches of the stems of indeterminate tomato plants.
Firstly, too much nitrogen causes poor flowering and fruiting. It leads to lots of leafy growth at the expense of tomato fruits and flowers. Secondly, excess nitrogen promotes tall, spindly tomato plants rather than stocky, strong ones.
Yes, you can cut the tops off leggy tomato plants, but the better method is to bury the long stem. Tomatoes can grow roots anywhere along their stems, so laying the plant sideways or in a deep trench when transplanting creates a stronger root system.
For many, it's best to avoid pruning in the fall because it can stimulate new growth that will be damaged by cold. On the other hand, there are a few plants to prune in October, especially if you want to keep your garden looking gorgeous right through to spring.
Never plant fennel, brassicas (like cabbage, broccoli, and kale), potatoes, or corn near tomatoes. These plants can stunt tomato growth, compete aggressively for nutrients, or spread devastating diseases and pests.
Tomato plants become tall and leggy because they are stretching for light, experiencing excessive heat, or being given too much nitrogen fertilizer. This causes weak, elongated stems as the plant prioritizes vertical growth over building a strong, sturdy structure.
Encouraging the last few to ripen
The simplest is to bring them into a warm room and place them in a paper bag with a ripe banana or apple. Both release ethylene gas, which encourages ripening. Keep the bag loosely closed, check daily, and you'll often find the tomatoes take on full colour within a week.
How to Support Tomatoes
Sprinkling baking soda around tomato plants is a common, often debated, gardening hack used to increase the sweetness of the fruit and reduce fungal disease. It works by slightly lowering soil acidity (raising pH) and, when used in sprays, creating an alkaline surface that hinders fungi like powdery mildew.
Perennials (Peonies, Daylilies, and Iris): Cut back perennials that have finished blooming to tidy up the garden and reduce pest issues. For plants like peonies, remove foliage to prevent overwintering fungal spores. While some plants benefit from fall pruning, others are best left untouched until spring.
To stop your tomato plants from growing too tall, use a process called "topping". Simply use sterilized pruning shears to snip off the main growing tip of the plant, always cutting right above a healthy flower cluster or branch node. This directs the plant's energy into ripening existing fruit rather than stretching upward.
I would trim the lower branches to improve airflow and also help prevent any disease from the soil. Large cherry is indeterminate so it will keep growing higher. Yes, agreed, trim back all those lower leaves up to around 6 inches from ground level and even more if they are touching the soil.
Yes, you can pinch or cut off the main growing tips of tomato plants (a process called "topping") to redirect the plant's energy toward ripening existing fruits instead of producing new leaves. However, this is usually only recommended for specific situations and types of tomatoes:
Pull tomato plants in the fall right after the first frost, or sooner if they are diseased, dead, or failing due to temperatures consistently below 55°F (13∘𝐶). Pick all remaining fruit, including green ones, just before the first frost hits, as frost kills the plant and ruins the fruit.
Coffee grounds provide tomato plants with slow-release nitrogen for leafy growth, trace minerals like potassium and magnesium, and beneficial organic matter. They also help improve soil drainage and can slightly deter pests like slugs and snails.
When tomato plants grow large and lush but produce no fruit, the most common culprit is a nutrient imbalance (too much nitrogen), extreme temperatures, or poor pollination.
Especially for a leggy tomato transplant, it's a good practice to bury a significant portion of the transplants stem under the soil. Deeper planting will allow the tomato transplant to grow stocky as it receives direct sunlight after being placed outdoors in the garden.
Yes, it is perfectly okay to cut the top off ("topping") tomato plants, but timing is everything.
Baking soda (sodium bicarbonate) is used to control fungal diseases, deter pests, and slightly reduce soil acidity. However, it must be applied with caution; overuse can cause dangerous salt buildup and damage plant tissue.
Planting tomatoes in the same spot year after year depletes specific soil nutrients and builds up harmful soil-borne diseases and pests. To maintain healthy plants and high yields, it is highly recommended to rotate crops—waiting at least three to four years before planting tomatoes in the exact same location.