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sun burn on Jades

I do the same slow acclimation to full sun that I’ve always done and for some reason, I really burnt my jades this year. They haven’t even been moved into full sun yet. Seems really odd.

Comments (15)

  • 4 years ago
    last modified: 4 years ago

    That last photo shows quite a burn...your 'slow' was probably not slow enough. Variegated plants - as this one seems to be - need usually less sunlight IMO; or really longer period of acclimation. Judge the length of acclimation by how strong is the sunlight, not comparing to previous years.

  • 4 years ago

    Disappointing. It will revover. I guess it was too much, too soon.

  • 4 years ago

    can you absolutely rule out cold damage?

  • 4 years ago

    It's important to keep in mind that an individual leaf's ability to acclimate to more or less sun isn't unlimited. Something I wrote to explain why some leaves might burn, no matter how long the acclimation period:

    Light Acclimatization

    The degree to which a leaf can 'acclimate' to changes in photo load is limited. IOW, you can't expect a leaf that emerged under a full sun light load to acclimate to light levels in a dim corner, any more than you can expect a leaf that emerged in a dim corner to acclimate to a full sun site; this, no matter how long you allow for gradual acclimation. Too, the plant's ability to adapt to higher light loads is greater than its ability to adapt to lesser light loads.

    Using a 1-10 numerical example to illustrate (numerical value of 1 is low light, 10 is high light): If a leaf emerges where the light level is measured at 5 units, it's range of adjustment might only be to 3.5 on the low side, but 8 to 8.5 on the high side. When the level of adjustment required is greater than what the plant is genetically programmed to deal with, the leaf is shed and this can occur with conspicuous or relatively inconspicuous damage to the leaf. While shed leaves can never be replaced, per se, new branches can form, with new leaves on the new branches, in the axils of dying leaves or from latent buds immediately above scars left by shed leaves. Too, whenever a new leaf appears it will be perfectly acclimated to whatever the photo load is where the plant is positioned (within the limits of what it is genetically programmed to tolerate).

    If the dark leaf (lower left) is damaged and shed or simply snipped off, it is lost forever. No leaf will ever grow again from the point on the branch where the leaf was attached. However, that the leaf might be lost comes with the potential for a new branch to grow from dormant buds immediately above the point where the leaf was attached. To see this occurring, look at the next leaf (upward) on the left side. The primary leaf is still attached, but there is already a branch growing in the leaf's axil (crotch). What determines whether a new branch forms (or not) is a growth regulator/ hormone which is synthesized in all plant tissues, but primarily at the growing tips of branches (apical meristem) where branch extension occurs.

    Here, the 2 new branches growing in the leaves' axils were forced to grow by removing the tip of the cutting.

    Al

  • 4 years ago

    If you remove all of the damaged leaves that are now blocking the light, new ones will be able to grow more easily.

  • 4 years ago

    Ken, I brought them in when the forecast was below 50. Unless the temps were way off, it shouldn’t be freeze damage.

    Al, as always, you have good info. Much appreciated.

    Tiffany, I was debating doing a major chop on the ones with damage. I’ll have to asses them and decide.

  • 4 years ago

    I would say Don't chop unless you were going to chop anyway.


    A few of my Jades burn every Spring, despite my efforts to acclimate them. It does spoil the foliage, certainly, but I don't let it bother me anymore. The worst offenders are my Hummel's Sunset and my Red Horn Tree. Those two highly photo-reactive cultivars just get toasted. But then they grow new leaves that look wonderful.


    Josh

  • 4 years ago

    Hey Mike!

    After thinking about it, that’s probably what I’ll do.

  • 4 years ago

    Hi ))
    After doing it to this one it got really full

  • 4 years ago

    Mike's is beautiful!

    I have cut/pruned this one because I didn't like etiolated growth; leaving only a small branch with 2 leaves:

    Same plant, growing in full sun; more compact & with very shiny leaves:

    So pruned for different reason, but will work the same!

  • 4 years ago

    It looks like I scorched a few aloes too. Not sure how those will do.

  • 4 years ago

    Mike, your plant is doing great! Looks very healthy!

    Rina, I’ve done some whacking like that in the past. Was going to do these plants next year with some more growth and the sunburn made me think about doing it sooner.

  • 4 years ago

    Mike, your Jade above is sooooo beautiful!

  • 4 years ago

    Thank you for the nice kind comments. I love this one too)

    It's a variegated crosby compact I think?I think I got it from a member who use to come here from Germany/ It loves changing colors for sure.

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