When people think of a trellis, they usually associate it with vines or flowers, maybe even vegetables. But a trellis is also an ideal way to grow fruit. A trellis is a specifically shaped frame with places for a plant to grab onto and grow upward. When growing fruit on one, it is important to understand what size you need for the fruit variety, as well as how to train the fruit to grow up onto the trellis.
Decide what type of trellis you need. The most common trellis, a two-dimensional lattice or fan shape, is ideally used for south-facing walls for plants like apples, pears, grapes, and figs. A larger three-dimensional trellis should be used for vining fruits, like grapes, kiwi, blackberries, gooseberries, raspberries, etc. These must be strong enough, and widely spaced, to support heavy vines laden with fruit.
Place the trellis in an area where the fruit plants will get adequate sunlight and have easy access to water, whether it is a drip irrigation system or sprinkler.
Position the trellis directly behind or on either side (depending on the type of trellis you have) of the fruit plant. It must be secured to something (even two posts in the ground) or propped up against a wall or fence.
Position the fruit plants against the trellis, loosely tying vines or branches with plant ties, or carefully weaving them among the wire support. As they grow, wind the branches or vines up along the trellis, in and out of holes and around the edges. Some have hooks secured to certain parts of the trellis, to secure plants more easily.
Continue to train the fruit plants until they learn to work themselves up the vine as they grow and thrive. Look over it about once a week to see if you need to readjust. As the plant grows, you may need to expand the trellis to accommodate the size.