Kapok and hibiscus are not interchangeable garden plants. Confirm the botanical name and mature size before choosing a site based on a similar-sounding common name.
Hibiscus is the bush of the mission of the martic hibiscus.
So both are completely different plants.
Similarity
Hibiscus is called: kumblton, ribs, petunia
It can be seen here that don't be called the same name, but the species is not the same.
Hibiscus
Deciduous shrub, 3 to 4 meters high, small branches are yellowed with yellow star.
Flower monozoab in the branches of the branches, 4-14 mm long stalks, small bracts 6-8, linear, flower-shaped, 14-20 mm long, splitter 5.
Color has pure white, pale pink, lavender, purple, etc. 5-6 cm in diameter, ovate in front of the petals, 3.5-4.5 cm long, is sparsely flexible by cilia and star-shaped; the stamens are about 3 cm; the flowers are inconsistent.
Growing habits
The climate, cold and moist, cold-resistant, soil requirements, can grow in clay.
Kow cotton form
Dried leaves, high reachand of 25 meters, tree b bedish white.
Flower monosoding top leaves, usually red, sometimes orange red, diameter is about 10 cm; calyx-shaped, 2-3 cm long, hairless, lame yellow short-yellow hair, calyd 3-5, semi-circular .
Growing habits
Happy and warm and dry environment. Bless cold, high-profile, fertile, good-drained neutral or microaly acid sand soil.
Related reading: Growing Hibiscus in Pots: Identify the Plant First.