Answer: Tomato cages work wonderfully well to support determinate type tomato plants - the kind that grow to about 5' tall then flower and produce fruit without growing much taller. It sounds as though you might be growing indeterminate tomato plants - the kind that continue to grow all season long, with the potential to grow upwards of 8' tall. Since your cages are in place and already too short, you'll do your plants a favor by providing support in the form of a trellis. Just drive stakes into the ground on one side of the plants and string wire or twine between the stakes so that it looks like a checkerboard. Then poke the vines through the holes between the wire or twine as they grow. Hope you have a bountiful harvest!
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