Be Cautious about placing plants immediately in direct sunlight. Introduce them to full sun slowly, over a period of 8 to 10 days.
Hibiscus MUST have a well-drained, moisture-retentive soil. Even though some cultivars are more tolerant of drainage conditions than others, all tropical hibiscus need a well-drained growing medium.
Most commercial “jungle mixes” and professional potting mixes are fine as long as they drain well and retain moisture without breaking down too quickly. Add some composted hardwood bark if it appears that the soil lacks sufficient porosity. Ideally the potting mixture should be as close to 6.8 as possible and contain a pH buffer.