Cold Climate Gardening

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Frost Damage–or Disease?

May 6th, 2008 by Kathy Purdy · 8 Comments 

Image of pale daylily and yellow colchicum foliage

These plants don’t look too happy, but I’m not sure if it’s the cold that put them in a snit, or a viral infection. Left to right: Daylily 2E, Colchicum giganteum, Daylily 4B, C. ‘Harlequin,’ Daylily 4C, C. speciousum

After nearly two weeks of warm, frost-free weather in April, my garden got socked with a 22 degree (-6C) night. I would like to think these poor plants are suffering from frost damage, but I know streaking in the leaves is a symptom of many plant viruses.
Image of colchicum yellow and brown colchicum foliageImage of bleached out daylily foliage
Please, faithful readers, if any of you have seen plants with this kind of leaf damage and know what it is, I’d love to benefit from your expertise. If you click on either of the above close-ups, you will get a much larger image that may make diagnosis easier.

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8 responses so far ↓

  • 1 Tina // May 6, 2008 at 3:59 pm

    It sure looks like frost damage to me, but I’m far from being an expert.
    I’m sorry they got nipped, but they should look better with a little good weather.

  • 2 extremegardener // May 6, 2008 at 10:22 pm

    My guess is frost, for what it’s worth. I had some similar looking damage a few nights ago on some cauliflower recently transplanted (in northern Vermont).

  • 3 Carol, May Dreams Gardens // May 7, 2008 at 1:24 pm

    I’ll “third” what the others said. I think it is frost damage. If it were disease, wouldn’t you have seen signs of it before the frost?

  • 4 Ottawa Gardener // May 7, 2008 at 8:58 pm

    The daylily looks like frost damage to me. I recognize that fainting white colour.

    Hope they make a full recovery.

  • 5 Marie // May 8, 2008 at 4:24 pm

    Great information! I live in Montana and the weather here is quite hard on plants. I have found that planting small plants in containers and leaving them indoors as long as possible works great. Then it works great to bury the container up to the rim in the desired spot.

    With this there is no disturbing the root and that helps the plant withstand temperature changes.

  • 6 kate // May 9, 2008 at 1:04 am

    Ouch! I am sorry to hear about the frost - that looks like frost damage to me. Hopefully, that is the end of any frost in your area!

  • 7 Monica // May 9, 2008 at 8:48 am

    Kathy, how are the plants looking now, a few days later? I bet they will still bloom despite the leaf situation. Let us know!
    ~ Monica

  • 8 Marie // May 12, 2008 at 11:19 am

    My plants are looking great after the frost thanks to the type of plants I used. I found a website that was a huge help! Check it out. ;)

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