(as of Oct 25,2021 16:06:05 UTC – Details)
Sow hibiscus seeds indoors 10-14 weeks before last spring frost date using a seed starting kit
Soak seeds in room temperature water for about 8 hours to speed germination
Sow seeds ¼ inch deep in seed-starting formula
Keep the soil moist at 70-75 degrees F
Seedlings emerge in 14-21 days
As soon as seedlings emerge, provide plenty of light on a sunny windowsill or grow seedlings 3-4 inches beneath fluorescent plant lights turned on 16 hours per day, off for 8 hours at night. Raise the lights as the plants grow taller. Incandescent bulbs will not work for this process because they will get too hot. Most plants require a dark period to grow, do not leave lights on for 24 hours.
Hibiscus are deciduous shrubs with dark green leaves; the plants can grow to 15 feet tall in frost-free areas. Flowers may be up to 6 inches diameter, with colors ranging from yellow to peach to red. Hibiscus can be planted singly or grown as a hedge plant; they can also be pruned into a single-stemmed small tree. The flowers are attractive to butterflies and hummingbirds.
Many gardeners do not cut back perennial flower seed heads in the fall, but wait until early spring before the new foliage appears. This provides food for wildlife over the winter.
Sun Exposure ： Full Sun, Part Sun
Hardiness Zones ： 5, 6, 7, 8, 9
Bloom Time ： Summer, Fall