These taller perennials usually remain in the 3 to 4 feet high range under most conditions. Use them behind and among low to medium height growing perennials, as specimen plants, near the middle to the back of border, in front of medium and large shrubs and very tall perennials, and around larger tree form plants. Some of these will make nice container specimens and when used in combinations for large and very large containers. Growing conditions may affect the plant's ultimate size. This list may also include some tropicals that are grown as die-back perennials in zone 8B so just keep that in mind if you are in a colder climate.