I grow many daylilies. If you need more information on them, visit the web site of the American Hemerocallis Society at www.daylilies.org. Yours need to be divided every 2or 3 years to keep them blooming prolifically .Six weeks before first frost date is the latest they should be divided or planted. I have won a blue ribbon and several reds and yellow ribbon in my Daylily Club's annual flower show. The flowers in the show are strictly daylilies we raise. Check out the web site and check for a club in your area. I am in Region 12 which is the entire state of FL. My club is the Tampa Bay Daylily Society.
this is our clubs' website:
http://www.bads.us/