Price per 2 seeds. Pelargonium undulatum (Geraniaceae) The flowers are from white to cream and yellow to pink with red markings. 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 : Worcester. Date of harvest : December 2013.