Astilbes Fail to Thrive - Knowledgebase Question

kalamazoo, MI
Question by dfgquilter
April 21, 2009
HI,
I LOVE ASTILBIES BUT I HAVE A HARD TIME GETTING THEM TO GROW VERY MUCH. THEY ARE NEXT TO MY HOUSE ON THE NORTH SIDE.
THEY GET ABOUT 1/2 DAY SUN. IS THIS ENOUGH?
ALSO, WHAT ELSE IS NEEDED TO PRODUCE A BIG PLANT WITH A BIG BLOOM LIKE IT WAS WHEN I BOUGHT IT? THEY DEFINATELY ARE LACKING SOME IMPORTANT INGREDIENT.
THEY SEEM TO GET SMALLER EVERY YEAR AND I DONT WANT THEM TO DIE.
PLEASE HELP.
THANKS, DORIAN


Image
Answer from NGA
April 21, 2009

0

It may be that your soil is just to hard and compacted for your astilbes to thrive. I would dig the plants this spring, spread 4-5 inches of organic matter such as compost or aged manure over the bed, dig it in to a depth of 8-10 inches and then replant the astilbes. They should double in size when planted in rich soil. Best wishes with your astilbes!

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