E Meaney,
Dimorphanthera, like most members of Epacridaceae, needs about 2 years of alternating 90 day cycles of 20C and 4C [starting with a warm cycle] and must NEVER dry out. You would do well to sow in a mix of finely ground sphagnum peat and vermiculite, in several layers of ziplock bags, so it can be transfered between 20C and 4C without drying out..