The Q&A Archives: daylilies

Question: Thank you so much for your anwers! I have another about my Stella d Oro flowers. Every year they are beautiful in spring, then I get buds but no flowers. They have not been thinned in years. The buds dry up. They are in partial shade with sun in the afternoon. They face south.

Answer: Glad you find this service helpful! Daylilies are usually insect pest free but occasionally thrips or budworms can damage the unopened flower buds and cause them to drop without opening. Try cutting off a few of the flower buds when you notice they are beginning to look as though they won't open. Place them in a plastic baggie for a day or two and you'll probably see either thrips or budworms exit from the flower buds. Several species of thrips have been found on daylilies. They are extremely small narrow-winged elongated insects gray-black insects about the size and shape of the upper part of a small exclamation point (!). They feed on young developing buds and stems causing brown, corky areas on the stems and bent and twisted flowers. The damage causes discolored, mis-shapened flowers and reduces flower bud set. Buds may drop without opening. If you find thrips, you can spray your plants with Insecticidal Soap according to label directions. Bud worms are a little more difficult to control because a flying insect lays an egg on the undeveloped flower bud and then flies away. The egg hatches and the larvae feeds on the petals and other flower parts before exiting the bud. Hope this information helps you determine just what might be happening with your daylilies.

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