One type of perennial flower that I really love is shrub-like perennials. These are plants that quickly grow large in one season and even when they aren't flowering, put on quite a show. The one that's blooming right now is hardy hibiscus.
Hardy hibiscus grows in zones 4 to 9 and is different from the woody, tropical, shrub hibiscus. The hardy hibiscus is a perennial, but dies back to the ground each winter. That doesn't stop it from being a showpiece! The 8-inch diameter, colorful flowers appear on shrubs that can grow 3- to 6- feet tall. The colors range from pure white to deep red in the 'Luna' series. This series only grows 2- to 3- feet tall. There are varieties with burgundy colored leaves as well such as 'Midnight Marvel' and 'Evening Rose'. There are bi-colored varieties, such as the pink and red 'Perfect Storm', and even a light yellow colored variety called 'French Vanilla'.
For best flowering, plant in full sun on well-drained, moist soil. Add compost in spring once the plants emerge and keep plants well weeded. The plants die back to the ground in fall, but leave the stems into winter as beneficial insects sometimes overwinter in them. Cut back the stems in spring and be patient. The new shoots are often slow to emerge from the ground.
Hardy hibiscus has few pests, but the hibiscus sawfly can defoliate leaves in late spring. Check for these small caterpillars on the underside of the leaves and handpick them or spray with an organic product such as Spinosad, in the evening when bees aren't active.
