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What's wrong with my Thuja plicata 'Virescens'?

last month

It looked fine on October 6th.

We had a few hours of 25d morning of October 8th, and subsequent checks revealed no damage.


We also had temps of 33d morning of the 11h and 36d & 34d mornings of the 13th & 14th but I didn't think these were that fussy about near freezing temperatures.

We did have a weird Fall where nothing wanted to shut down, and we still have green leaves on the trees in places around town.

Just gave it a deep watering the other day and it's been cool enough I don't think it's heat stress.


This is what I saw when I looked this morning.


What is it?

(10-16-2025).


TIA

Comments (6)

  • last month

    Not sure, but the very ends seem all that's affected, so perhaps grew too late to get hardened off enough to resist the frost? My green giants get a fair amount of fall browning, but it's all on the shaded insides.

    BillMN-z4a thanked bengz6westmd
  • last month

    I'm not sure either but they're not 'Frost Hardy' and we did have 80's & a 90 the last week of September and first few days of October.


    I only keep track of watering in my head, but I know it got watered at least once a week during this dry spell. I hardly ever let things get on the too dry side, unless I'm sure the plant can take it.


    Could be I didn't notice any damage after the hard freeze, and I generally keep a close eye on things here. But sometimes with the high noon sun, the brightness could've fooled me because I wasn't expecting anything bad to happen until late winter or spring.


    This Thuja Plicata v. had a hard time recovering from the sunburn that occurred during its first spring here. It took a while, and it acted sluggish but did begin rapid, healthy new growth about mid-summer. This year the high temperatures stayed in its preference range of ~80 or below.


    Well, nothing has changed, so I'll be leaving it 'as is' now until spring, so we'll see then.


  • last month
    last modified: last month

    Most T Plicatas source from a cool, but still maritime climate, so maybe alittle surprised they would even survive in a z4 continental climate. But it did get thru the your previous winter, so there's hope.

    BillMN-z4a thanked bengz6westmd
  • last month

    Yes, it's in a spot close to the house where winds are almost nonexistent.

    Even the ground wasn't frozen middle of March when I planted it a year ago.

    I can't remember how much snow we got earlier in the 23/24 season, but it had all melted by this time of year (picture from 3-11-2024).


    We did get some ground freeze again but soon after, later in March it snowed heavily again. At any rate, it didn't show any damages until it sunburned early April of 2024.

    I think getting snow cover this season will have the most effect whether it lives or dies, or if we get another winter, with lowest low of -18d, like we did the year before last, with a few minus teens and minus single digits thrown in.


    Being in a slightly warmer zone now has its pros and cons.

    Cooler weather in September /October could've had a better effect on this plant shutting down for the season, which might've got it through our first killing frost unscathed.

  • last month

    Beautiful plant Klark! Thanks for showing it.


    Yes, interior populations of T. plicata are said to withstand -53d, with coastal populations.... not so much.

    This T. plicata was free for ordering $100 or more, from CK.

    It was the only thing they offered in their collection of free gifts, that I thought might have a chance here, but I really didn't know at the time, anything about interior/coastal populations, same for my A. concolor (lowiana) that came with the same order. But I learned something.

    8^)