Calotropis gigantea, Giant milkweed, Crown flower, 20-100 seeds
Synonyms: Asclepias gigantea
Common names: Crown Flower, Remiga, Merigu, Giant Indian Milkweed, Giant Milkweed, Ivory Plant, Swallow-wort, Asclepiad Tree, Kayu Berduri, Kemengu, Rembaga, 牛角瓜, 大皇冠花
Calotropis gigantea, the crown flower, is a species of Calotropis native to Cambodia, Vietnam, Bangladesh, Indonesia, Malaysia, Thailand, Sri Lanka, India, China, Pakistan, and Nepal.
It is a large shrub growAing to 4 m (13 ft) tall. It has clusters of waxy flowers that are either white or lavender in colour. Each flower consists of five pointed petals and a small "crown" rising from the center which holds the stamens. The aestivation found in calotropis is valvate i.e. sepals or petals in a whorl just touch one another at the margin, without overlapping. The plant has oval, light green leaves and milky stem. The latex of Calotropis gigantea contains cardiac glycosides, fatty acids, and calcium oxalate. The roots also contain Calotropone.
This plant plays host to a variety of insects and butterflies.
Start seeds indoors 2 months before final frost
Seed starting medium. Use peat moss mix with vermiculite, perlite, or both
Soak seeds in warm water 24 hours before planting
Use a seedling heat mat for faster germination
Sow directly after final frost in spring (not recommended for annual zones unless you plan to overwinter)
Propagate from softwood stem cuttings. This also allows you to start the season with larger plants. Plants do not flower in year 1 starting seeds.
Container garden option
Do not overwater! C. gigantea does not like having wet feet
Overwinter in pots for annual zones.