2019 has been a particularly brutal year for Spring Sickness with my daylilies. Every year I get maybe one or two plants that exhibit Spring Sickness, but this year I bet I have between 15-20. I have added five photos of different plants affected by Spring Sickness. I don't panic when I see this because in most cases I can simply remove the affected foliage and as the weather warms up the daylilies continue to grow and bloom completely normal.
The exact cause of Spring Sickness remains a mystery, and it appears in daylilies throughout zones 3-9 in the United States. Typically the entire daylily clump is not affected -- usually it's only a couple of fans. There is not a definitive answer for why this happens. A fungus of some kind is suspected, but as of yet it's unproven. It is also worth noting that daylilies are randomly affected. Just because a cultivar has Spring Sickness one year this does not mean it will be affected next year, or ever again for that matter.
To read more about this phenomenon: http://web.ncf.ca/ah748/qanda.html
The exact cause of Spring Sickness remains a mystery, and it appears in daylilies throughout zones 3-9 in the United States. Typically the entire daylily clump is not affected -- usually it's only a couple of fans. There is not a definitive answer for why this happens. A fungus of some kind is suspected, but as of yet it's unproven. It is also worth noting that daylilies are randomly affected. Just because a cultivar has Spring Sickness one year this does not mean it will be affected next year, or ever again for that matter.
To read more about this phenomenon: http://web.ncf.ca/ah748/qanda.html
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