Mimosa Seeds - Sensitive Plant2nd Year Maturity. Sensitive Plant mimosas guarantee one of the most interactive, playful, and entertaining blooms youll ever grow. Sensitive Plant seeds grow a neat 12 24 tall shrubby mimosa bursting with delicate 1 pink pom pom blooms whose leaves are known world wide to be seisomonastic (responding to physical touch and movement). Sensitive Plant mimosa seeds are a perfect grow for adding a brush of grace to window boxes, rock gardens, hanging