Here in North Texas, I bring them in before Halloween. Generally, that's when temps begin to fall below 50 degrees at night.

Lonnie

I will start bringing in mine when the temps. start dropping as low as 50F in evenings. Usually when the evening temps. lower and the day temps. stay higher, I will notice a decrease in water needs. Then I know it is coming close to time.

Last year when temps. lowered at night. In my closed mini greenhouse structure I was able to leave out a bit longer. Even put in a small heater to keep temps. up to 60F at night.

Not sure what I will do this year.

Rick

This is by far my worst experiment ever. I wanted to see at what point adeniums start dropping their leaves outdoors so I kept one plant well into mid-autumn when night temperatures were going below 16C but day temps were still above 20C. Of course, I forgot it was out there. Two nights in a row when temps suddenly dropped below 10C, it was a goner. This particular cold damage looked like this:

Pagan

Wow Pagan this plant was grafted too. So it sounds like 50F/10C might be the magic number to avoid leaving trees exposed. This is my first year having plants outside. Some of them are really thriving and some have been dormant. I just ordered a 300W LED to wake them up. The trees that are dormant I will put under obnoxious lights. Those that are thriving this season will get to take a nap for winter.

Tracy

And remember that Adenium somalense is more cold-sensitive and should be kept at minimum 50 F/15 C.

I carried all mine into my greenhouse last weekend. It is just getting too cold at night for them and I do not want mine to go dormant yet. Once the temps get really cold I will move them all into the house.

You can leave them out in 40 deg F weather BUT...the soil has to be dry. If the soil is wet they will die within a couple weeks. I am speaking from experience. I keep my greenhouse heated to 45 deg F and they will survive in there if they are not watered all winter. I no longer take the chance and will eventually bring them into the house.

Also, I've cut back on the watering now too. It is so sad to see that summer is getting close to ending. It sure went fast.

Martin thanks for the tip on A. somalense. Mine are still too small to be outdoors, but this time next year they will be outside.

Ladylotus, I am sorry to hear you are already packing it in and here we are in August. I thought we were short-changed on our summer here in the midwest, but you really got a bad deal. Normally August is our hottest month of the year. This year temperatures have been mild, highs in the 80F/27C range and lows in the 55F/13C range. My outdoor plants have stopped growing completely. It did go fast.

Jedoba enjoy your warm weather while it lasts, I hear we have an el Nino winter ahead of us. Mark the words of Ned Stark, "Winter is coming..."

Tracy

I truly wish I lived in about zone 12. I don't look forward to the ~1 month of actual winter we do get. I don't like anything below 60F, but we'll have tons of that. I LIVE for summer and warm weather, and have always had slight depression in the winter.

I am so stoked for el Niño. I hope we get boatloads of snow. Despite being in sunny NM, I'm only three hours from good skiing in Durango, CO, where I've already purchased a season pass for next season.

Speaking of seasons, my year currently has three. College football season, ski season, and adenium growing season, admittedly with some blurred lines.

I too hope you get plenty of snow so they keep making Ice Road Truckers lol love it :) I never complain about cold winters over here, we get like minus 6 if lucky, minus 40 over there is not uncommon, ouch!

Those of us that are in the northern regions or the middle of the country that will be impacted are not so much looking forward the the piles of snow. Last winter was quite mild, this winter is sure to be quite the opposite. It will make some great TV hey Phil?

Does anyone take their Adeniums out of their pots during their dormancy?

Tracy

Mine don't really go dormant. The Arabicum stops growing new leaves. My obesums all managed to continue growing, with the exception of the coldest month in December. As cold as it gets here, they seemed to be just fine in the south facing window. I do plan on getting a thermostat and using a windowsill heating pad to keep their roots warm.