All of my daylilies do that on the new growth. Especially the spring growth. They grow out of it. I think it may be due to rapid growth. So that could probably be caused by getting a dose of fertilizer and/or lots of water when the growing temperatures are right for maximum growth. I do tend to throw some fertilizer on my daylilies from time to time and they are grown in large containers where initially part of the mix consists of purchased potting soil which contains fertilizer. And I do water those containers. I try to never let them get very dry because it can be difficult to get re-establish the moisture in the growing medium. All the other plants I grow are really jealous of the daylilies because they get meals on a very irregular basis - if at all
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