- 1). Wait until the early spring or early fall to plant the Formosa azalea and choose a location that has well-drained soil. The plant requires at least partial sunlight exposure.
- 2). Spread a 3-inch layer of compost on top of the planting site and work it into the top 12 inches of soil using a tiller. If you do not have a tiller, rent one at an equipment supply company or a home improvement store.
- 3). Insert a soil pH tester into the soil to ensure the soil is slightly acidic. The Formosa azalea requires a pH level of between 4.5 and 5.5. If the pH reading it higher than this, add iron sulfate or ammonium sulfate using the amounts indicated on the packages to lower the pH.
- 4). Dig a hole that is the same width as the pot the Formosa azalea is in and 1 inch shallower.
- 5). Water the azalea well while it it still in the pot. Remove the roots from the pot and loosen the root ball with your fingers, brushing away one-third of the potting soil. Insert the roots into the center of the hole and back fill the hole with soil.
- 6). Water the soil under the Formosa azalea until it is damp to the same depth as the root system. After planting, water as needed to keep the top of the soil moist until you see new growth on the plant.
- 7). Spread a 1-inch layer of mulch around the base of the Formosa azalea to keep the soil moist.
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