To keep your Astilbe blooming take care of following things: 1. Although Astilbe prefers organic, well-drained, acidic soil, the plant must be moderately moisture retentive. The soil shouldn't be permitted to get very dry and may require a more customary water system during a hot, dry climate. 2. While Astilbe usually withstands moderate sunlight, most astilbe varieties perform best in the shade. If your plant is in full daylight, give them shade (particularly during hot evenings) or think about moving the plant to a more appropriate area. 3. Astilbe plants are substantial feeders and may not germinate without sufficient sustenance; this is a typical purpose behind Astilbe not blossoming. Furnish a moderate delivery compost with a proportion of 3-1-2 in spring, and afterward feed the plant high-nitrogen manure when the plant is setting buds in pre-fall or early harvest time.