Physostegia (Obedient Plant)
Growing Physostegia in the garden adds a bright, spiky flower to the late summer and fall flower bed. Obedient Plants and other Physostegia are easy to look after, but unlike their name suggests they are not obedient. They are so named because stems can be bent to stay in place, not for the plant’s habit in the garden. They are liable to spread so cut the roots back hard to stop them from spreading. The soil that they grow in should be kept moist in dry periods by watering. It is also necessary to supply mulch to the plants to ensure that the soil stays cool. In fall cut the plant back to the ground.