Hope the seedlings are growing on fine, here's ome info -
Deciduous shrubs or small trees suitable for the cool greenhouse or outside in mild parts of the country. Valuable for their handsome foliage and fluffy flowers.
The hardiest species and, with its delightful fluffy pink flowers in summer, withstands severe frost.
Grow in final 5 in pots of John Innes potting compost No1 , preferably witha cane for support. Keep the plant moist at all times, and give a weak liquid feed at intervals of two weeks from June to Sept. Keep plant ina well lit position, but give light shadeing during hottest months (hope you did this over past few weeks !) Ventilate when temperature exceeds 21 C. Keep the atmospher humid by spraying.
Good luck this is a beautiful plant to Bonsai.