The variety P. ‘Vivid’ is the latest to flower—in September, the 12-18 inches spikes coming from quick spreading underground shoots and which need curbing, or setting back intoin spring. P. ‘ Bouquet’ grows 2 ½ feet and is pink, July-September, when the 3 feet deep pink spikes of P. ‘Summer Spire’ taper up to flower on slender spikes. These two, and the pretty white P. ‘Summer Snow’ also 3 feet are less rampant than P. ‘Vivid’, but grow with vigour in any ordinary soil. They are easily divided in spring. The name ‘Obedient Plant’ comes from the fact that when the little tubular arranged in rows on the spike, are pushed aside, they stay put without snapping off or springing back.
Plants which arecannot often be termed distinctive, but this is true of Physostegia. Spike forming plants are moreover very helpful in breaking up any tendency to uniformity in a border or bed, and these with their long flowering habit, fill such a need. They are however subjects that thrive in good soil which does not dry out severely and though this produces fuller, taller spikes, it also involves the need, after a year or two, to thin out some of their or to replant.