Dichroa febrifuga, commonly known as Chinese Quinine or Blue Evergreen Hydrangea, is a semi-evergreen to evergreen shrub in the Hydrangeaceae family native to Southeast Asia and the Himalayan region. Seeds are extremely fine and light-dependent, requiring careful handling and consistent moisture to germinate. This species exhibits variable germination patterns and may benefit from cold stratification if initial warm-temperature sowing does not produce results.
Before sowing
Soak seeds for 24 hours in hot to warm water. If germination fails after 4 weeks at warm temperatures, apply cold stratification for 4 weeks at 4°C, then return to warm conditions.
Sowing
What to expect
Tips
Sow seeds on the surface of fine, well-draining, moist substrate without covering, as light is essential for germination. Lightly press seeds into substrate to ensure good contact. Maintain consistent high humidity using a transparent cover or humidity dome. Provide bright, indirect light without direct sun exposure. Use fluorescent lighting if natural light is insufficient. Never allow seeds or seedlings to dry out. Seeds are extremely fine; handle with care. If no germination occurs after 4 weeks at 20–22°C, apply cold stratification at 4°C for 4 weeks, keeping the medium moist, then return to warm conditions. Gradually acclimate seedlings to lower humidity and brighter light before transplanting. Use acidic to neutral soil for optimal seedling development, as this influences future flower color intensity.
Sources: Twining Vine Garden, Plant Flower Seeds, Missouri Botanical Garden, Plants for a Future, Ferri Seeds, PlantFlowerSeeds.com
