Tuesday, January 11, 2011

Dawn of the dead

A lethal night gave way to the dawn of the dead.

That could be the byline for a horror movie starring cold-sensitive plants, and that’s exactly what happened last night.

Typically, when we have frost, it’s for a few hours around dawn. But last night we hit the 32°F mark at 11p.m. and we were below freezing until 9 a.m. this morning (the low was 26.7°F according to Weather Underground.) That’s 10 hours of frost, and that’s bad news for many of our tender plants, not to mention our citrus crop. It’ll take a few days to get a definitive picture of what is damaged, but one thing is clear already: This was the most brutal night of this winter. (Yes, I know we’re all “sensitive petals”, as our Australian friend Bill would say, but we can’t help it.)

The succulents I’d covered with a frost blanket appear to be OK, as are the potted plants on our front porch. But there are still casualties; with any luck they will recover in time.

110110_frost_front_yard
Variegated Eureka lemon in the front, yellow lotus banana behind it. Some of the leaves on the Eureka lemon don’t look good, especially the tender new growth. There are quite a few flower buds as well. Not sure what will happen to them.
110110_frost_musella_lasiocarpa
Yellow lotus banana (Musella lasiocarpa). It looks terrible but it’s actually hardy to 10°F. It will grow new leaves as soon as we have consistently warm weather.
110110_frost_alocasia
Giant elephant ear (Alocasia macrorrhizos 'Borneo Giant'). The leaves are toast. I’m frankly surprised they lasted as long as they did. The tubers are hardy to zone 8 and will produce new leaves in the summer as soon as the soil temperature is consistently above ~60°F.
110110_frost_euphorbia_helenas_blush
Euphorbia ‘Helena’s Blush’ (Euphorbia amygdaloides hybrid). It is supposed to be hardy to 0°F. No clue why it collapsed like it did.
110110_frost_callas
Our calla lilies (Zantedeschia aethiopica) look very droopy. Last year I covered them up but still lost about half of the leaves. They’ll bounce back fairly quickly once it gets a little warmer.
110110_frost_agave_chiapensis
Large Agave chiapensis with frost damage (dark spots). Hardy to 28°F. I should have covered this one up; that’s what I did last winter and it sustained no damage. This is just cosmetic damage, but agaves don’t exactly grow fast so the plant will be disfigured for a while.
110110_frost_agave_celsii
Agave celsii, supposedly hardy to 20-25°F. This one is in a pot in an exposed spot on our front porch. All I had to do is move the plant to a more sheltered position to protect it…but I didn’t. The dark spots are damaged tissue. This isn’t lethal but the leaves will be pock-marked.
110110_frost_echium_wildpretii
Tower of jewels (Echium wildprettii). Endemic to the Canary Islands and supposedly hardy to 20°F. Too soon to say if there’s any real damage. I lost one of these stunning plants last fall for no apparent reason.

Our bamboos are OK even though these two sub-tropical Bambusas had quite of a bit of frost on their leaves.

110110_frost_bambusa_chungii2
Baby blue bamboo (Bambusa chungii ‘Barbelatta). Hardy to 21°F. Some leaves have had a yellowish cast for a few weeks now and may fall off soon. No cause for worry, the plant itself it fine and will grow new leaves in the spring. The culms are unharmed.
110110_frost_bambusa_oldhamii
Giant clumping timber bamboo (Bambusa oldhamii). Hardy to 21°F as well. No damage here, but this is the first time I’ve seen this much frost on its leaves.

Most perennials in our garden aren’t fazed by a low of 27°F. They keep on trucking as if nothing had happened. In fact, frost makes their leaves extra beautiful, especially since it’s so fleeting.

110110_frost_scabiosa
 
110110_frost_salvia_
 

Citrus trees and fruit are fairly sensitive to frost. I checked our Washington navel orange tree, which is full of fruit, and it looks unharmed. I picked a couple of oranges and they tasted fine, but that doesn’t mean much at this stage. It’ll be a few days before frost-damaged fruit begins to turn mushy and lose its flavor (that happened last year).

Some experts recommend picking frost-damaged fruit as quickly as possible and juicing it right away in order to preserve the flavor. I’m not sure yet what we’ll do; the optimist in me hopes that most of our fruit had enough protection from overhanging branches and is OK. We’ll reassess tomorrow.

Readers in the citrus belt: Farmer Fred, a well-known Sacramento-area master gardener with a weekly radio show, has some useful information about citrus protection on his website. Read this and this.

4 comments:

  1. Crazy Jack Frost... we've been in a deep freeze for weeks, but then we expect cold temps, just not so low for so many days. Hope your fruit survives.

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  2. I thought it was November already when your blog title 'Dawn of the Dead' came up nearly the same time as the new blogpost of one of the other blogs we're following titled 'Zombie Apocalypse'....

    The plants look sad at the moment but most of them should recover once the warmer weather sets in, especially the Musella and Zantedeschias. Some cosmetic damage may persist on the Agave chiapensis and celsii. I lost a Celsii at -4C before, but I know others who had them sail through fine down to -7C.

    Can't wait for spring!

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  3. As much as seeing your photos of beautiful, green plants during the winter "upsets" me (that's jealousy I believe), these photos of the same plants with damage are much worse! I hope there's nothing too severe going on with any of these.

    Is a low temp of 26ºF normal for your area, or highly unusual?

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  4. 26°F isn't unheard of but it's not common. According to Weather Underground, the low for all of 2010 was 29.1°F, for example. People around here are rarely prepared for these fast, vicious dips--myself included, considering that I forgot to cover plants I should have. In a way, it's not bad getting a wake-up call from Mother Nature, otherwise we might think we're in zone 10.

    The only plants we did loose are some tender salvias from southern Mexico. But that's par for the course. Everything else should bounce back. I'll check up on the agave celsii and chiapensis later this morning. I did cover them last night but we didn't even get down to freezing :-).

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