The long, ovate, serrated leaves are fairly non-descript during the non-flowering part of the season. Some varieties turn red in the fall. The white, pink and lavender flowers form along spikes, in four neat vertical rows, and begin opening from the bottom up. Although obedient plant can spread throughout the garden, the individual plants tend to be clumpers. The flower stalks will bend and stay bent if moved or blown over. Large plants may require staking and mature plants will thin out in the center and can take on an open, floppy form, telling you it's time to divide them.