What training means and why tomato plants need it
Training is the practice of guiding how a tomato plant grows by removing branches, tying stems to supports, and managing foliage. Unlike pruning, which removes dead or diseased material, training shapes the plant's structure while it is still alive and growing. Most gardeners train tomatoes to grow upward on stakes or cages rather than sprawling across the ground, which saves space, improves air flow around the leaves, and makes harvesting easier.
Indeterminate tomatoes—varieties that grow continuously throughout the season, like 'Brandywine' and 'Sungold'—almost always need training because they can reach 6 to 8 feet tall. Determinate varieties, which grow to a fixed size and stop, usually need less intervention but still benefit from basic support. Training also reduces disease by keeping leaves off wet soil and allowing the sun to reach ripening fruit.
Key Takeaways
- Indeterminate tomatoes require staking or caging and regular pruning of side shoots to focus energy on fruit production.
- Determinate tomatoes need support but tolerate more foliage and require less frequent pruning than indeterminate types.
- Install stakes or cages at planting time to avoid damaging roots later, and tie stems loosely with soft material like cloth strips or twine.
- Remove suckers (shoots that grow between the main stem and branches) on indeterminate varieties every one to two weeks during the growing season.
- Stop pruning and training four to six weeks before your first expected frost so the plant can focus energy on ripening remaining fruit.
Choosing between stakes, cages, and trellises
The support method you choose depends on the tomato variety, the space you have, and how much time you want to spend managing the plant. Stakes are single vertical poles—usually 5 to 8 feet tall—driven into the ground next to the plant. They work best for indeterminate varieties and require regular tying as the plant grows. Stakes take up minimal space and give you full control over the plant's shape.
Cages are wire or plastic structures that surround the plant. They are easier to set up and require less maintenance than stakes, but they take up more horizontal space and can collapse under the weight of a heavily laden indeterminate plant. Cages work well for determinate varieties and for gardeners who prefer a hands-off approach. Trellises and string systems are useful if you are growing multiple plants in a row and want to maximize vertical space, though they require more initial setup.
Install your support system at planting time, before the tomato is in the ground. Driving a stake through the root ball later will damage the plant and invite disease. If you are using a cage, place it over the seedling as soon as you plant it.
Tying stems to supports without damaging them
As the main stem grows, tie it to the stake or cage every 8 to 12 inches using soft material that will not cut into the stem. Cloth strips, old t-shirt scraps, or soft twine work well. Avoid wire, thin string, or anything that will tighten as the stem thickens. Tie the material in a loose figure-eight pattern: loop it around the stake, cross it over itself, then loop it around the stem. This creates a buffer between the stem and the support.
Check ties every two weeks during active growth. A tie that was loose in June may be strangling the stem by August as the plant thickens. Loosen or replace ties as needed. If you are using a cage, the plant will naturally weave through the openings, and you may not need to tie anything—the cage itself provides the support.
Removing suckers on indeterminate varieties
Suckers are shoots that grow in the angle between the main stem and a branch. On indeterminate tomatoes, removing suckers directs the plant's energy into fruit production rather than foliage. On determinate varieties, suckers are less of a concern because the plant naturally stops growing at a set size. Start removing suckers when they are small—about 2 to 4 inches long—by pinching them off with your fingers or cutting them with clean pruners.
Check for new suckers every one to two weeks during the growing season. The more you remove them early, the less work you do overall. If you miss a few weeks and suckers have grown large, remove them anyway, but expect the plant to redirect energy back into foliage for a few days. Do not remove all the foliage on an indeterminate tomato—the leaves feed the fruit. A good rule is to remove suckers but keep at least two or three main stems and their branches.
Pruning lower leaves to prevent disease
As the plant grows, remove leaves that touch or hang below the lowest fruit cluster. These lower leaves are most likely to splash with soil-borne water during rain or watering, which spreads fungal diseases like early blight and septoria leaf spot. Remove these leaves once or twice during the season, starting when the plant is about 2 feet tall.
Work on a dry day and use clean pruners or scissors. Remove only the leaves, not the stems. Stop this pruning by mid-August in most climates, because the plant needs its remaining foliage to ripen the last of the fruit before frost arrives. If you live in a very humid climate or have had disease problems in past seasons, you may remove more lower foliage than a gardener in a dry climate would.
Topping plants in late summer to speed ripening
Topping means removing the growing tip of the main stem to stop the plant from producing new flowers. This redirects energy into ripening the fruit already on the plant rather than making new fruit that will not mature before frost. Topping is most useful for indeterminate varieties in regions with short growing seasons.
Top your plants four to six weeks before your first expected frost date. If your first frost typically arrives on October 15, top plants around September 1. Remove the top 4 to 6 inches of the main stem, including any flower buds. After topping, stop all other pruning and training—let the plant focus entirely on ripening what it has. You may see new suckers emerge after topping, but leave them alone at this point.
Training determinate varieties with less intervention
Determinate tomatoes grow to a fixed height—usually 3 to 4 feet—and produce most of their fruit within a short window. Because they naturally stop growing, they need less aggressive training than indeterminate types. Plant them in a cage or against a short stake (4 to 5 feet tall) for support, but you do not need to remove many suckers or prune heavily.
You can remove a few lower leaves for disease prevention and thin out dense foliage if air flow is poor, but determinate plants tolerate more foliage than indeterminate ones. The trade-off is that determinate plants produce their entire crop at once, which is useful if you plan to can or freeze tomatoes, but less useful if you want fresh tomatoes throughout the season.
Frequently Asked Questions
Can I train a tomato plant without a stake or cage?
Yes, but it is not ideal. Unsupported plants sprawl across the ground, which increases disease risk, makes harvesting harder, and wastes garden space. If you must grow without support, choose a determinate variety and plant it in a spot where air can flow freely around it. Mulch heavily to keep fruit off bare soil.
What is the difference between a sucker and a regular branch?
A sucker grows from the angle between the main stem and an existing branch. A regular branch grows directly from the main stem. Suckers are smaller and thinner than branches and emerge between the main stem and the branch, not at the tip of the stem. Once you spot a few, you will recognize them easily.
Is it too late to train my tomato plant if I did not stake it at planting time?
You can still add support later, but be very careful not to drive a stake through the root ball. Drive the stake at an angle away from the plant, or use a cage that can be gently worked over the plant without damaging stems. Tie the plant loosely to the new support and expect some stress for a few days.
Should I remove all the leaves on my tomato plant to speed up ripening?
No. Leaves feed the fruit, and removing too many will slow ripening and reduce the size and flavor of remaining tomatoes. Remove only lower leaves that touch soil and dense foliage that blocks air flow. The plant needs its upper leaves to ripen fruit in late summer.
When should I stop training my tomato plant?
Stop all pruning and training four to six weeks before your first expected frost. At that point, remove the growing tip to redirect energy into ripening existing fruit, then leave the plant alone. Continued pruning late in the season removes foliage the plant needs to finish the harvest.