Gardenias are hardy shrubs that are commonly grown in the southwestern United States. They yield white silky flowers that produce a strong and heady fragrance, resulting in the nickname "cape jasmine." Gardenias can grow almost anywhere, as they can survive harsh winter temperatures and freezing. However, they thrive and produce more flowers in warmer climates.
Plant gardenia bushes during the early summer so that they can become established before winter. Ensure that they receive between six and eight hours of direct sunlight each day. Mix organic compost with the soil prior to planting to increase drainage, and add nutrients to the soil.
Use a shovel to dig a hole of equal depth and about twice as wide as the root ball. Place the root ball directly into the hole, and then gently pack the soil back into the opening. Water the gardenia bush thoroughly to compact the soil around the roots.
Water gardenia bushes during the summer once every two to three weeks. Use a soaker hose to slowly release a large amount of water around the plant. Keep the soil moist at all times, but do not allow any standing water.
Use a highly acidic fertilizer to feed the plants. Azalea and camellia fertilizers are recommended. Fertilize once weekly beginning in early spring until late summer. Follow the manufacturer's directions for proper dosage. Spread 2 to 3 inches of mulch directly around the gardenia bush to help retain moisture and protect from weeds.
Prune gardenia bushes in the late winter and early spring. Use pruning shears to cut away the old woody stems near the center of the bush to increase air circulation and allow sunlight into the inner portions of the plant.