Guavas are plants in the Psidium genus, although this common name typically refers specifically to Psidium guajava, commonly known as the apple guava. This tree originates from Central America, although they are also in commercial cultivation in other tropical regions of the world. The guava tree produces an sweet fruit that can can exceed 4 inches long. Home gardeners frequently propagate guava trees from cuttings.
Select a planting area in full sun that does not encounter freezing temperatures during the year. The guava tree is sensitive to frost and only grows in U.S. Department of Agriculture hardiness zones 10 and up.
Fill the planting bed with rich gardening soil that provides good drainage for the best growth, although guava trees can tolerate poor soil. These trees prefer acidic soil with a pH between 5 and 7, and do not tolerate salt.
Cut a root from a mature guava tree with pruning shears. Slice the root into sections 5 to 10 inches in length with a clean, sharp knife.
Dig holes in the planting site that are at least 2 to 4 inches deep with a garden trowel. Place a root cutting from the guava tree in each hole and fill the hole with soil.
Water the soil thoroughly with 2 inches of water to ensure the cutting becomes completely wet. Water the cutting whenever the top few inches of soil becomes dry. Do not allow the soil to become waterlogged. Mature guava trees are highly tolerant of drought.
Apply a high-nitrogen fertilizer to the mature guava tree each month beginning in the second year of growth. The total amount of nitrogen in the fertilizer should be 2/3 oz. per application.