B and T World Seeds' reference number:
USDA average, annual, minimum temperature Zone:5
Type of plant - shrub to tree
Flower: large WHITE,deep RED centre
Height in meters: 3
Hibiscus syriacus Red Heart
is included in the following B and T World Seeds flowering plant categories:
31: House and Container Plant Seed List
40: Shrub Seed List, Hardy and Tender
43: Herbaceous Border Plant Seed List
146: Standard Trainable Plants
161: Edible Flowers
185: Plant Species whose germination is improved by Smoke
Hibiscus syriacus Red Heart seeds will usually germinate in 30-60 days, even under good conditions germination may be erratic. Sow seeds about 2mm deep in a Well drained seed sowing mix at about 22°C.
Soak in warm water, which should be changed daily. Most seeds swell up when they are soaked, those that do should be sown immediately. Seeds that don't swell can be gently scarified.