A tomato plant in full fruit load can weigh as much as a three-year-old child, and most gardeners only realise it the day the stem snaps. In this step, you'll learn how to support your plants before they need it, how to tell at a glance whether your variety should be pruned or not, why a sucker that already carries fruit shouldn't be cut off, how to decide whether or not to top your tomatoes, chillies and peppers at the end of the cycle, and how to remove leaves for the plant's health rather than out of habit. Bonus: turn every sucker you prune into a second plant, for free.
Support before support is needed
A young plant stands up on its own, light, its stem still supple. Then the fruit arrives and the weight climbs fast: under full load, an adult tomato plant can weigh 7 to 20 kg, and sizing your support for at least 14 kg per plant is nothing excessive. The problem isn't the weight itself, it's when you deal with it. Driving a stake into a pot already colonised by roots means cutting blindly through what you can't see; waiting for the stem to lean means repairing a plant that's already stressed rather than supporting one that's growing straight.
The right window is early: put the tie in place from 6 to 8 leaves (around 20 cm), or at the latest at the first flower truss.
In a grow tent, adapt that length to your real usable height, often 90 to 100 cm under the lamp in a standard tent (seen in the Getting started step): a 1.80 m stake only makes sense in open ground or under a noticeably higher ceiling.
Always place the clip under a leaf, never under a fruit truss.
One tip comes up in almost every conversation between gardeners: never tighten a tie. Use a flexible material, raffia or a figure-of-eight tie, that leaves some slack, and add another one a notch higher each time the stem gains height, instead of fixing everything from the start.
🍅 Rule of thumb for a row of several plants: the "Florida weave" uses stakes of 1.2 to 1.5 m, one stake every 2 to 3 plants, and about 4 layers of twine spaced 15 to 20 cm apart. On an indeterminate, topping at the height of the stakes stops the stem from overhanging the structure and eventually bending under its own load.
Put the stake in at the same time as the plant, never after: driving a stake into an already colonised pot means cutting roots blindly. The move takes thirty seconds at planting; it saves you an invisible root injury and a plant that stalls without you understanding why.
