The three main ways to hold up tomato plants

Tomato plants need support because their stems grow heavy with fruit and break under their own weight. The three methods that work are stakes (a single wooden or metal pole driven into the ground), cages (wire or plastic frames that surround the plant), and trellises (horizontal or angled structures the plant climbs). Which one you choose depends on the tomato variety, how much space you have, and how much time you want to spend tying and pruning.

Determinate tomatoes — varieties that grow to a set height and stop — usually work fine in a cage. Indeterminate tomatoes — varieties that keep growing taller all season — almost always need a stake or trellis because they will outgrow a cage by mid-summer. The best time to install support is when you plant the seedling, before the roots spread and before the stem gets thick.

Key Takeaways

  • Install support at planting time, not later, so you do not damage roots or break stems.
  • Determinate varieties fit in cages; indeterminate varieties need stakes or trellises because they grow taller than cages.
  • Tie stems to stakes loosely with cloth strips or soft twine so the stem can expand as it thickens.
  • Cages work best if they are at least 5 feet tall and driven 6 inches into the ground so wind does not tip them.

Using stakes: the simplest method for most gardeners

A stake is a single pole — usually 6 to 8 feet of wood, bamboo, or metal — driven 6 to 12 inches into the ground next to the plant. As the tomato grows, you tie the main stem to the stake every 8 to 12 inches with soft material so the stem does not cut into itself. Use cloth strips, old t-shirt scraps, or soft twine rather than wire or hard string.

Wooden stakes are cheap and straightforward to find at any garden center, but they rot after a few seasons. Metal stakes and bamboo last longer. Tie the knot on the stake side, not the stem side, so if the knot slips it does not strangle the plant. Leave a little slack — the stem should move slightly in the tie — so it can expand as it thickens.

The main drawback of stakes is that you have to prune indeterminate tomatoes to a single or double stem, or the plant becomes too bushy to tie up. If you do not want to prune, use a cage or trellis instead.

Using cages: the hands-off choice

A cage surrounds the plant and holds it up without tying. Most cages sold in stores are 4 to 5 feet tall and made of wire or plastic. They work well for determinate varieties and small indeterminate varieties, but tall indeterminate plants will grow right through the top by August.

Buy the tallest cage you can find — 5 or 6 feet is better than 4 feet — and drive it at least 6 inches into the ground so wind does not tip it over. If you have tall indeterminate varieties, you can stack two cages or add a stake through the middle of the cage for extra height. Do not wait to install the cage; put it in place when you plant the seedling so the stem grows up inside it naturally.

Cages need almost no maintenance once they are in place. The downside is that they take up more horizontal space than a stake, and they can be awkward to store in winter. Plastic cages crack in cold weather, so bring them inside or replace them every few years.

Using trellises: the space-saving method

A trellis is a frame — usually made of wood, bamboo, or string — that the plant climbs as it grows. Trellises work well in small gardens because they take up less ground space than cages. You can build a straightforward trellis from two stakes and horizontal strings, or buy a pre-made wooden or metal frame.

Train the main stem up the trellis by tying it loosely every 8 to 12 inches, the same way you would with a stake. As side branches grow, you can tie them horizontally to the trellis or let them hang down. This method gives you the most control over the plant's shape and makes harvesting easier because the fruit hangs at eye level.

Trellises work best for indeterminate varieties because you can make them as tall as you need. The trade-off is that they require more tying and pruning than a cage, and they take longer to set up. If you grow tomatoes every year, a sturdy wooden or metal trellis will last many seasons and pay for itself.

Tying techniques that do not damage the stem

The way you tie the stem to the support matters. Use a figure-eight knot: loop the material around the support, cross it back over itself, then loop it around the stem. This creates a buffer between the knot and the stem so the stem does not cut into itself as it grows thicker. Tie on the support side, not the stem side.

Check ties every two weeks during the growing season. As the stem thickens, ties that were loose will become tight and can strangle the plant. Loosen them or replace them with longer material. Cloth strips and old t-shirt scraps are gentler on the stem than twine or wire.

Do not use wire, plastic zip ties, or anything hard that does not stretch. These cut into the stem as it expands and can kill the plant or create a weak point where disease enters.

Choosing the right support for your space and variety

If you grow determinate varieties in a small space, a cage is the easiest choice. If you grow indeterminate varieties or want to save space, a stake or trellis is better. If you have room and do not mind tying, a trellis gives you the most control and the easiest harvest.

Consider wind exposure too. If your garden is windy, use a stake or trellis rather than a cage, or drive the cage very deep into the ground. Cages can tip in strong wind if they are not anchored well.

Whatever you choose, install it at planting time. Waiting until the plant is tall and heavy risks breaking the stem or damaging roots when you drive the support into the ground.

Frequently Asked Questions

Can I use a cage on an indeterminate tomato?

Yes, but only if the cage is very tall — at least 6 feet — and you are willing to prune the plant or let it grow through the top. Most standard cages are too short for indeterminate varieties by mid-summer. If you want to use a cage, buy the tallest one available or stack two cages together.

What is the best material for tying tomato stems?

Cloth strips, old t-shirt scraps, and soft twine are all good because they do not cut into the stem as it thickens. Avoid wire, plastic zip ties, and hard string. The tie should be loose enough that you can slip a finger under it.

When should I install the support?

Install it at planting time, when you put the seedling in the ground. If you wait until the plant is tall, you risk breaking the stem or damaging roots when you drive the support into the soil.

Do I need to prune if I use a stake?

If you use a stake, you should prune indeterminate tomatoes to one or two main stems so the plant does not become too bushy to tie up. With a cage or trellis, you have more flexibility and can leave more branches if you have the space.

How deep should I drive a cage into the ground?

Drive the cage at least 6 inches into the ground so wind does not tip it over. In very windy areas, drive it 8 to 12 inches deep or anchor it with stakes and twine tied to the ground.