Many plants, as they mature, need support to help them grow. This is especially true of tomato plants and such climbing plants as beans, cucumbers, and winter squash.
As tomato plants mature, they begin to sprawl along the ground because they become heavy with fruit. If left to grow without training, the fruit is exposed to sunscald and inclined to rot. An effective way to prevent these problems is to train the plants to grow vertically by staking the plants. Another simple training method is to build tomato cages. As the vine grows, guide the stems into the cage.
You can use your vertical space by designing a trellis system to support twining and climbing plants like beans, cucumbers, and winter squash. An important consideration is sturdiness. Vines and wind will be tugging on it for several months, so build the trellis well. The stems of bean plants will twine around the trellis for support; with a little bit of guidance, cucurbits will grab the trellis with their tendrils.