Design criteria such as plant form, texture and height are important considerations for any landscape. The ideal situation is to have a nice balance of such traits so the garden does not become monotonous. Too often, perennial gardens are dominated by rounded or mounded forms and daisy-like flowers. Here are a few tall, upright perennials that will provide contrast and variation in form, texture and height to the other plants in a bed or border.
Delphinium – This majestic beauty is most associated with the magnificent gardens of England or the Pacific Northwest. They will grow in more temperate areas too but they may require a little extra care. Plant them in a site protected from the wind for best results. They emerge early in the spring, so be prepared to cover them if frost threatens. During the growing season, the very tall types such as the Pacific Giant hybrids may need staking and a shot of extra fertilizer if their leaves begin to turn yellow during the growing season. Finally, individual plants tend to be short lived and may need to be replaced after four or five years. Continue reading