Cut back stems three to four inches from top in late autumn. Fertilize regularly during the growing season.1
Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Luna White is thought of as hardy, so this plant will survive close to or on freezing temperatures. Luna White requires a soil ph of 6.1 - 7.5 meaning it does best in weakly acidic soil - weakly alkaline soil.1 https://www.gardenia.net/plant/Hibiscus-moscheutos-Luna-White