Drosera cistiflora mauve (Droseraceae). Drosera cistiflora is a winter growing, summer dormant sundew. It’s growth is unusual in that it comes out of dormancy as a rosette, then puts out a weak to moderately strong stem as the season progresses. Its’ flowers are the largest in the genus and this one have large mauve flowers.? Sowing : Use a soil mix of 1 part sand to 1 part peat, and just sprinkled the seeds over the top of the soil. Date of harvest. June 2011. Locality : Hermanus.