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PlantSnap
Plant Care
Saint john's hibiscus
(Hibiscus kokio saintjohnianus)
Also Known As
Saint john's hibiscus, Saint john’s hibiscus, Kokio
About This Plant
Hibiscus kokio saintjohnianus is a species of flowering plant in the family Malvaceae, native to the Hawaiian Islands. It is a small tree or shrub that can grow up to 15 feet (4.57 meters) tall, with glossy, dark green leaves and bright red flowers that bloom year-round.
Plant Care Instructions
Outdoor Size Range
Up to 15 feet (4.57 meters) tall
Light Requirements
Hibiscus kokio saintjohnianus requires full sun to partial shade. It is best to provide it with at least 6 hours of direct sunlight per day.
Humidity Needs
It prefers a moderate to high humidity level, around 50-60%. You can increase humidity by misting the leaves or placing a tray of water nearby.
Fertilizing Schedule
Fertilize every 4-6 weeks during the growing season (spring and summer) with a balanced fertilizer. Reduce fertilizing in the fall and winter.
Pruning Guidelines
Prune in the late winter or early spring before new growth appears. Remove any dead or diseased branches and shape the plant as desired.
Common Pests and Diseases
Common pests include aphids, mealybugs, and spider mites. Hibiscus kokio saintjohnianus is also susceptible to root rot if overwatered.
Indoor Size Range
N/A
Watering Schedule
It prefers well-drained soil and regular watering, but be careful not to overwater as it can lead to root rot.
Temperature Range
It prefers warm temperatures between 60-85°F (15.5-29°C). It can tolerate cooler temperatures down to 50°F (10°C) but may drop its leaves.
Growing Season
It can be grown year-round in tropical climates, but in cooler climates, it is best to grow it indoors or in a greenhouse.
Growing Difficulty Level
Hibiscus kokio saintjohnianus can be moderately difficult to grow due to its specific temperature, humidity, and watering requirements.
USDA Hardiness Zones
Hibiscus kokio saintjohnianus is hardy in USDA zones 10-11.
Did You Know?
Hibiscus kokio saintjohnianus is the state flower of Hawaii and is often used in traditional Hawaiian leis.
