Price per 5 seeds. Phyllobolus prasinus (Mesembryanthemaceae). The thickened stem of this plant makes it attractive to caudex collectors. Sowing : Sow in trays, pots, etc of good seed compost in a propagator or warm place to maintain an optimum temperature of 20-25C.? Cover with peat or sand. Locality : Ex Hort. Date of harvest : November 2016.