Supporting Tomato Plants: Canes, Strings and Cages Guide

Illustration of tomato plants in pots with bamboo supports

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Supporting tomato plants is essential for maintaining plant health, improving airflow, and preventing the heavy weight of ripening fruit from snapping stems. The method of support depends entirely on whether you are growing cordon (indeterminate) or bush (determinate) varieties. Cordon tomatoes are vigorous, tall plants that require vertical training and regular tying to a support, whereas bush tomatoes are compact and only require minimal support to prevent drooping when heavily laden with fruit.

Table of Contents

Distinguishing between cordon and bush supports

Before selecting your materials, you must identify the growth habit of your variety, as the support requirements differ significantly:

Cordon (Indeterminate): These plants continue to grow in height throughout the season. They require tall, sturdy supports—such as 1.8m stakes or overhead strings—and must be pruned to a single main stem to stay manageable.
Bush (Determinate): These grow to a fixed, compact size. While they do not need tall vertical training, their side-shoots can droop or snap under the weight of the crop, requiring shorter, localized support.

Using canes and stakes

Canes are a versatile option for both greenhouse and outdoor growing. Bamboo canes, hazel poles, or wooden stakes are commonly used. For cordon tomatoes, choose a stake tall enough for the variety and planned stopping height, allowing extra length for secure insertion into the soil.

Installation and tying

Insert the cane into the soil next to the plant at the time of planting to avoid damaging the root system later. As the plant grows, the main stem must be attached by hand, as tomatoes do not naturally cling to supports. Use jute string or soft ties to secure the stem to the cane at regular intervals. Ties should be loose enough to allow the stem to thicken without being choked.

Supporting bush varieties

Bush tomatoes do not require a single tall central stake. Instead, if you notice side-shoots beginning to droop under the weight of the fruit, insert short vertical canes specifically where the support is needed and tie the shoots loosely to the cane.

Using vertical strings

Vertical strings are highly efficient for greenhouse growing where overhead infrastructure is available. This method saves ground space and allows for easy adjustment of the plant’s height.

Setting up the string system

Tie strong suitable string to a sound support point designed to carry the crop load; do not assume any glazing bar can do so.
Allow the string to hang vertically.
Bury the end of the string under the rootball of the plant during the planting process.

The string should remain slack initially. As the cordon tomato grows, gently wind the main stem around the string. This provides a flexible support that moves with the plant.

Using cages

Cages provide a structural framework that is particularly useful for bush varieties or those grown in large containers. Cages prevent the plant from sprawling across the soil, which reduces the risk of fruit rotting and improves air circulation around the foliage.

Training and pruning for support stability

The effectiveness of any support system for cordon tomatoes relies on pruning. Without removing side-shoots, the plant becomes a mass of scrambling stems that are nearly impossible to support and are prone to collapsing.

Removing side-shoots

Check the plant during every watering session. Identify the joint where the leaf meets the main stem; any new shoot emerging just above this leaf should be pinched out or snapped off. This ensures the plant’s energy is directed upward into the main stem and the fruit trusses.

Topping the plant

To prevent the plant from outgrowing its support, remove the growing point of the main stem once it reaches the top of the cane or string. For indoor/greenhouse plants, this is typically done after seven fruit trusses have set; for outdoor plants, after four trusses. Cut the stem two leaves above the final top truss.

Diagnosing support failure

If your tomato plants are not responding well to their supports, look for these signs:

Stem Girdling: If the stem looks pinched or indented where the tie is located, the string is too tight and is restricting nutrient flow. Loosen the tie immediately.
Leaning Plants: If a plant in a pot is leaning, the support may be too short or the pot may be top-heavy. Check the anchoring and container stability, then move it to shelter if necessary. A wall nearby does not itself secure the support.
Snapping Shoots: In bush varieties, if stems snap despite support, the canes may be placed too far from the fruiting cluster. Add additional short stakes closer to the heavy fruit.

Useful products for this job

The links below open Amazon UK product searches. Check the exact item, seller, current price and compatibility before buying.

Bamboo canes (1.8m): Essential for providing vertical support to cordon tomato plants grown outdoors or in large pots. Match length and thickness to the variety, crop load and insertion depth; inspect supports and ties through the season. Search Amazon for Bamboo canes (1.8m).
Jute twine: Used for tying stems to canes or as vertical supports in greenhouses; preferred over plastic for being gentler on stems. Match length and thickness to the variety, crop load and insertion depth; inspect supports and ties through the season. Search Amazon for Jute twine.

Related garden guides

Sources and further guidance

Guidance researched in September 2026. The feature image is an AI-generated illustration. Product guidance is based on published information, not hands-on testing.