Guava trees produce a delicious tropical fruit that can be harvested for juice, deserts and preserves. Training a guava tree to grow flat against a wall or trellis is a good way to maximize fruit production while keeping harvesting easy and accessible. A trained guava tree can also be a work of art as the branches grow into geometrical shapes. This tree is a tropical that will only grow in warm climates such as southern California, Florida and parts of Texas. If you live in a cold climate you will have to plant your guava indoors, but even indoors, you can train your tree to grow on a trellis.
In the place where you want your tree to grow, create a structure for the tree to grow on. You can string wire between posts, purchase or build a trellis or build a fence or wall for your tree to grow on.
Plant a young guava sapling at the base of the structure. If the young tree is already in the ground you can form the structure next to the tree, being careful not to damage the young sapling.
Determine the shape you want your tree to grow in. The most common method is to have the branches running flat against the wall or trellis at equal distances like multiple arms spread out horizontally.
When the branches begin to form, carefully attach the ones you wish to keep to the fence, trellis or structure. Remove all other branches, such as those growing out away from the structure or towards it, using a pair of sharp pruning shears.
The tree will grow from the center, so once the lower branches are attached they will remain at that height for the duration of the tree's life. The next set of branches that emerge on the trunk can be attached to the fence using wire or rope. Again, cut off all branches you do not wish to keep.
Continue the process of attaching the desired branches and removing all the rest until your tree has reached maturity in the shape you wish it to hold.
As the branches mature, loosen the attaching wires so that they do not grow into the branch and kill the limb.