How much heat can palms take

[96720]

This is an experiment I didn’t plan on doing!! I work sunup to sundown I have recently purchased some royal palm seedlings so when I get home I go out to the greenhouse to water and check on my new babies, as I got close I didn’t hear the cooler running that’s not good the temperature that day was 114 when I opened the door it was blooming hot plus the humidity because it is a greenhouse so I am in the process of checking out the damage I am posting pictures that are not palms so you can see the damage. Orchids toasted 

[96720]

A dracena and fiddle leaf fig toasted 

[96720]

Chambyronia toasted but I think they will recover

[96720]

Big surprise chambyronia h not damaged

[96720]

Sygrus botryophora and beccariophoenix not damaged

[96720]

Attalea not damaged

[96720]

A shocker Dypsis prestoniana not damaged

[96720]

Another shocker Actinokentia divaricata very little damage 

[96720]

A real disappointment Dictyosperma album got burned really bad I’m not sure it will recover I was just looking for a place in the garden to plant it royals got toasted but will recover the baby royals took it pretty good Raphis and Gaussia also got toasted of course Phoenix palms mule palms showed no damage I would imagine it got to 140-150 degrees in the greenhouse with 114 outside 

[96720]

New frond opening on an otherwise fried chambyronia 

[OC2Texaspalmlvr]

that has to be heart breaking , hopefully many of your palms pull thru. 

T J 

[96720]

Yes!!! It’s a real bummer not just for palms but also orchids and bromeliads 

[BayAndroid]

Better install a backup cooling system in case this happens again. Backups are that one thing you don't want to buy, but will save you from complete failure. I'm sorry to see your losses here, it hurts the heart, I know the feeling. 

[HtownPalms]

Yikes! That's horrible. Good luck with everything pulling through. 

[Josue Diaz]

My greenhouse regularly tops 120F, but it is not in direct sun. As long as plants are well hydrated, and by extension humidity is high, all of my plants do fine. I have palm seedlings of all sorts in this setup (including chamaedorea, chambeyronia, sabal, livistona, licuala, phoenix, wodyetia...) and phalaenopsis orchids as well. I hope your plants recover! 

[96720]

I’m sure it was way over 120 with the damage I see it would have to be 140-150 or higher it was 114 outside. I guess a back up cooling system would be nice would have to have its own breaker the breaker blew for some reason I don’t know it hasn’t blown since I’m just having my wife check on it every hour during the hottest part of the day. In hind sight it would be nice to have some kind of alarm when the temperature reached maybe 120 like @Josue Diaz said his greenhouse reaches with no problems.

[sonoranfans]

many palms have died in greenhhouses in the phoenix area.  I had a shade house, no sun, and kept some things alive in it for a while.  the problem is you are ryig to keep moisture high inthe desert so you cannot let it just blow away.  But restricting airflow will retain heat from solar energy allowed into the greenhouse.  A greenhouse in heavy shade might work.  Plants can survive heat but not really recover.  Heat stress response causes oxidative stress which breaks down lipids in cell walls, damaging their function.  The real question is which palms can survive the most heat.   I don't have any confidence that extended 140F for hours can be survived without irreversible damage in the vast majority of palms.

[96720]

I have had palms in my greenhouse for years I buy seedlings and grow them big enough to plant in hell. I am curious to see how they pan out in a couple of months as time goes on more and more look bad