Luna White hibiscus is a beautiful hibiscus variety that is hardy to USDA zone 5. Gardeners with sunny growing areas can enjoy the beautiful blooms of the Luna White hibiscus during the weeks of late summer. An added benefit of growing these beautiful hibiscus flowers is the hummingbirds that will invariably find the lovely blossoms. Plant the Luna White hibiscus seeds in the spring and prepare for a breathtaking late summer display that will return every summer.
Prepare a sunny growing area in the spring as soon as the soil is warm enough to work. Cultivate the soil down to a depth of approximately 6 inches and spread 2 inches of compost over the top of the soil. Work the compost in with the garden spade and rake the soil surface smooth with the rake to finish preparing the garden area.
Space the seeds approximately 2 feet apart and cover them with ½-inch of soil. Water the seeds generously immediately after planting.
Keep the seeds evenly moist during germination. Germination may take several weeks. The optimal outside temperature for germination is between 68 and 75 degrees F.
Fertilize the Luna White hibiscus once per month by mixing the fertilizer with water according to package recommendations for the size of your growing area. Pour the fertilizer onto the soil around the hibiscus plants, being careful not to splash fertilizer onto the foliage of the plant.
Provide just enough water for the Luna White hibiscus to stay hydrated. Keep the soil evenly moist without over saturating it. Do not allow it to dry to the point of wilting or the number of flowers may be affected.
Cut the Luna White hibiscus down to just above the soil level when it wilts and fades in the autumn. The plant will return the following spring.