There are two dietes species that carry the common name butterfly iris. The rhizomatous plants in this genus, too, are known as fortnight lilies because their bloom crops come in two-week periods.

A. There are two Dietes species that carry the common name butterfly iris, so I'm not exactly sure which you have. The rhizomatous plants in this genus, too, are known as fortnight lilies because ...

Q. My butterfly iris looks healthy but flowers poorly. My fall-planted lobelia and sweet alyssum have not grown and have few flowers. -M.Z., Houston A. Although tolerant of poorer soils, butterfly ...

Garden columnist Dan Gill answers readers' questions each week. To send a question, email Gill at [email protected]. We have many African irises that I trimmed very close to the ground in early ...