Tall Hibiscus - Nursery PotTall Hibiscus Quick Care Guide Light & Water Prefers full sun for at least 6 hours a day. Water regularly, keeping the soil moist but not soggy; allow the top 2 3 cm of soil to dry between waterings. Humidity Thrives in moderate to high humidity; mist occasionally or use a humidifier if needed. Maintenance Fertilize monthly during the growing season, prune dead flowers and stems, and repot every 2 3 years if grown in a container.