After blooming has finished for the season, feel free to clip off any spent flower stems. Your astilbes will continue to provide attractive foliage until fall. After the first frost, the leaves may yellow; trim leaves if you wish and fresh growth will come next spring.Click to see full answer. People also ask, do astilbe come back every year?Astilbe are a herbaceous perennial which means they die back to bare earth over winter and re grow each spring. Astilbes are grown for their lovely fluffy plume like panicles 18-35cms long which are either red, pink, purple or white. do you deadhead Astilbe? Deadheading astilbe won’t encourage new flowers, so you should leave them in place through the fall. Eventually, the flowers will dry on the stalks but should stay in place. When winterizing astilbe plants, you can cut all the foliage off, leaving just a 3-inch (7.5 cm) stem above ground. Moreover, do astilbe bloom more than once? Each astilbe plant does not bloom all summer. Some bloom in late spring, others bloom mid-summer, and the late season astilbe plants bloom late summer or early fall. The bloom time for astilbe plants that are late season producers is typically August through September.What to do with astilbe after flowering? CARING FOR ASTIBLE AFTER THEY BLOOM Once astilbe flowers have lost their color, the stems may be cut to the ground and removed. You may also leave the flowers in place. The faded plumes will usually last until early winter, continuing to adding height and visual interest to your garden.