Why and when to string up tomato plants
Stringing up tomato plants keeps the stems off the ground, where they are vulnerable to rot, pests, and disease. It also makes the fruit easier to spot and pick, improves air circulation around the leaves, and lets you fit more plants in the same space. Most gardeners string indeterminate varieties—the tall, vining types that grow all season—though you can also support determinate (bush) types if they get heavy with fruit.
The best time to start stringing is when the plant is 12 to 18 inches tall and has several sets of true leaves. If you wait until the plant is thick and tangled, you risk breaking stems while trying to thread them through the string. Early support also trains the plant to grow upward from the start rather than sprawling sideways.
Key Takeaways
- Stringing works best when you start early, around 12 to 18 inches of growth, before the plant becomes thick and woody.
- The Florida weave method—running string horizontally between stakes and looping it around each plant—is the fastest way to support multiple plants in a row.
- Vertical string systems (tying string to an overhead support and wrapping the stem as it grows) work well for individual plants or containers.
- Check the string or ties every week or two during the growing season, because stems thicken and can girdle if the support becomes too tight.
- Use soft materials like cloth strips, twine, or commercial plant ties rather than wire or thin string that can cut into the stem.
The Florida weave method for row gardens
The Florida weave is the most efficient way to support a whole row of tomatoes. You will need wooden stakes (4 to 6 feet tall, depending on your variety), twine or soft string, and a way to find the string to the stakes—usually by tying it or using a staple gun.
Drive a stake firmly into the ground at each end of the row, about 6 inches from the first and last plant. As the plants grow, run a line of string horizontally along one side of the row, tying it to the first stake. Loop the string around each plant stem (not tight—leave an inch or two of slack), then continue to the next plant. When you reach the end stake, tie the string off. Repeat this process on the opposite side of the row, creating an X-pattern of support around each plant.
Add new horizontal lines of string every 12 to 18 inches of plant growth. Most indeterminate tomatoes need three to four layers of string by midsummer. The beauty of this method is that you can support 10 or 20 plants with just two stakes and a ball of twine, and you can adjust the string as the plants thicken without having to retie individual plants.
Vertical string systems for individual plants
If you are growing tomatoes in containers or prefer to support each plant separately, a vertical string system is simpler to set up. Tie a length of soft string or twine to an overhead support—a trellis, a wire strung between two posts, or even a sturdy branch—so the string hangs down next to the plant stem.
As the plant grows, gently wrap the stem around the string in a loose spiral, moving upward. The stem will naturally lean on the string and grow upward. You do not need to tie the stem to the string; the spiral wrapping provides enough support. This method works especially well for plants in pots because you can move the whole setup if needed, and it keeps the foliage open to sunlight and air.
For very tall or heavy-fruiting plants, you can use two strings—one on each side of the stem—to prevent the plant from leaning too far in one direction. Check the spiral every 7 to 10 days and add another loop of stem around the string as the plant grows.
Materials that work and materials to avoid
Soft, flexible materials are essential because tomato stems are tender and can be damaged or girdled by anything too rigid or thin. Cloth strips (old t-shirts or sheets torn into 1-inch strips), soft twine, jute, or commercial plant ties designed for vegetables all work well. These materials stretch slightly as the stem thickens and do not cut into the plant.
Avoid wire, thin plastic string, fishing line, or anything that does not give. Even if these materials feel soft when you first tie them, they will not stretch as the stem grows, and within a few weeks they can cut off the flow of water and nutrients to the upper part of the plant. Zip ties and rubber bands also tighten as the stem expands and should not be used.
If you are buying commercial plant ties, look for ones labeled as velcro-style or adjustable. These have a soft side that touches the plant and a hook side that grips itself, so you can loosen them as needed without untying and retying.
Checking and adjusting support as the plant grows
Tomato stems thicken significantly as the plant matures, especially in the lower 12 inches where most of the woody growth happens. Check your string or ties every 7 to 10 days during the peak growing season (late spring through midsummer). Look for any signs that the support is becoming too tight: a groove or indentation in the stem, yellowing or wilting above the tie, or a pinched appearance.
If you spot tightness, loosen the tie when ready. With cloth strips or adjustable ties, straightforward pull the knot or hook looser. With the Florida weave, you may need to add a new layer of string slightly higher up the plant to distribute the weight more evenly. Loose support is always better than tight support; the plant will lean on the string even if there is an inch or two of slack.
As the plant grows taller and heavier with fruit, the lower stems bear more weight. If a lower section of stem starts to bend or crack under the load, you can add a second tie or string just above the weak point to share the weight between two support points.
Pruning and training for better support
Removing suckers (the shoots that grow between the main stem and branches) makes the plant easier to string and reduces the overall weight the support has to hold. Indeterminate tomatoes produce dozens of suckers; pinching them off when they are small (1 to 2 inches long) directs the plant's energy into the main stem and primary branches rather than spreading it across a tangled mass of growth.
You can also remove lower leaves once the plant is 2 to 3 feet tall and the fruit on the lower clusters has set. This opens up the lower stem so air can circulate, reduces disease pressure, and makes it easier to see and adjust your support system. Leave the upper leaves intact; they power fruit ripening.
Training the plant to a single or double stem (rather than letting it branch freely) also makes stringing simpler. With a single stem, you can use a vertical string system and let the plant climb. With two stems, you can run two vertical strings side by side or use a wider Florida weave setup.
Frequently Asked Questions
Can I use a tomato cage instead of string?
Tomato cages work for determinate (bush) varieties that stay compact, but they are usually too small for indeterminate types. By mid-July, an indeterminate plant will be taller than most cages and will be growing out through the bars. String or stakes give you more flexibility to support the plant as it actually grows rather than forcing it into a fixed shape.
What if my string or tie breaks during the season?
Replace it when ready. A broken tie leaves the stem unsupported and vulnerable to breaking under its own weight or wind stress. Keep extra twine and cloth strips on hand so you can add a new tie or string within a day or two. If the stem has already bent or cracked, add support just above the damaged area to prevent further splitting.
Do I need to remove the string before harvest?
No. Leave the string in place until the plant stops producing and you pull it out at the end of the season. The string will not harm the fruit, and removing it mid-season exposes the stem to damage. If you are harvesting individual clusters of fruit, you can work around the string without disturbing it.
How tall should my stakes or support system be?
Indeterminate tomatoes typically grow 6 to 8 feet tall by the end of the season, though some vigorous varieties can reach 10 feet. Use stakes or overhead supports that are at least 6 feet tall, and ideally 7 to 8 feet if you have the space. If your support is too short, the plant will grow past it and become top-heavy and unstable.
Can I reuse string and ties from last year?
Yes, as long as they are still soft and flexible and show no signs of mold or rot. Soak cloth strips in a 10 percent bleach solution (1 part bleach to 9 parts water) for 10 minutes, rinse, and let them dry before storing. Twine and commercial ties can be wiped down and stored in a dry place. Discard anything that is stiff, cracked, or shows visible damage.