astilbe - Knowledgebase Question

bronx, Ne
Question by sshipp3571
June 14, 2010
Have astilbes in the back for about 4yrs. They never seem to bloom fully. We get a few plumes others who have astilbes have a plethora of plumes. What should I do

Answer from NGA
June 14, 2010


If the flower spikes appear small, thin, or stunted, it could be due to soil moisture, soil pH or lack of fertility. Astilbes grow best in partial sun, in rich, slightly acidic, evenly moist soils. If they experience a drought or are otherwise struggling, the flower spikes will be smaller than their potential. It's sometimes helpful to dig and divide astilbes. They can become overcrowded after 3-4 years in the garden. When you dig and divide you'll have the opportunity to amend the planting bed with compost or other organic matter to make sure it is loose and friable so it will drain well, yet hold just the right amount of moisture for your plants. Hope this information helps you determine just what the problem might be.

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