Description
A perennial herb or subshrub with dark green foliage and attractive pink flowers produced in profusion. While endangered in its native habitat in Madagascar, it has naturalized in other parts of the world and is widely cultivated as an ornamental as well as for its medicinal properties. Several alkaloids important in the treatment of cancer are extracted from the plant, and it is also widely used in traditional medicine. It can be grown as a perennial in frost free climates or as an annual in temperate zones.
Germination Guide
🌍 Madagascar
Easy
Catharanthus roseus (Madagascar Periwinkle) is an evergreen tender perennial native to Madagascar, commonly grown as an annual ornamental. Seeds are very easy and fast to germinate, requiring warm temperatures and darkness to sprout.
Germination
Germination time
Expect germination in
7 – 21 days
Temperature
Min 21°C
Ideal 24°C
Max 26°C
Light
🌑 Darkness required
Substrate moisture
💧 Medium
Substrate & Container
Recommended substrate
Moist, well-drained seed-raising mix or rooting mixture; pH 5.5-5.8 preferred
Recommended container
Shallow seed trays, punnets, jiffy pots, or seed-raising containers covered to exclude light
Growing Tips
Surface sow seeds 2mm deep; keep soil moist but not waterlogged; cover tray with plastic bag or vermiculite to maintain darkness; high humidity (100%) and warmth (77°F/25°C) accelerate germination; reduce humidity to 40% after cotyledon emergence; seeds remain viable 3-5 years
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