Outdoors, semi-shade and winter temperatures of -8°C

Pot next to wall, 140*100*30cm

The 30cm width can be the most decisive.  It can be 1 or more palm trees.  About 400 liters of soil.

Trunk maximum 25cm thick

Height, without limit.

 

Thanks!

Here's my contribution.  Likely Veitchia subdistichia.

If you want to minimize movement of the pot in winter I'd recommend Chamaedorea radicalis or microspadix.  Both can handle -8C temps and shade.  Radicalis is solitary while microspadix is a clumper with many stems.  If you prefer a fan palm you could try Acoelorrhaphe wrightii which is another clumper but unwanted stems can be trimmed off.  If you're not concerned about moving the pot pot several times a winter you could go with many other choices (like Veitchia, Ptychosperma, some Dypsis, etc.)

2 hours ago, palmsOrl said:

Here's my contribution.  Likely Veitchia subdistichia.

Impossible to get!  At least in Spain

1 hour ago, Fusca said:

If you want to minimize movement of the pot in winter I'd recommend Chamaedorea radicalis or microspadix.  Both can handle -8C temps and shade.  Radicalis is solitary while microspadix is a clumper with many stems.  If you prefer a fan palm you could try Acoelorrhaphe wrightii which is another clumper but unwanted stems can be trimmed off.  If you're not concerned about moving the pot pot several times a winter you could go with many other choices (like Veitchia, Ptychosperma, some Dypsis, etc.)

The pot is permanent, built next to the wall, so always outside.  It must withstand hot and cold, direct sun from 2 meters high.  Perhaps C. Radicalis combine the "standard" variety with the arborescents to have different heights, what do you think?
 

 

Sounds like a good idea!   C. radicalis has had no issues for me in my garden at 40C temperatures and even recovered from -13C  unprotected.  They are also more tolerant of sun exposure and drought - amazing how tough and attractive they are!

33 minutes ago, Fusca said:

Sounds like a good idea!   C. radicalis has had no issues for me in my garden at 40C temperatures and even recovered from -13C  unprotected.  They are also more tolerant of sun exposure and drought - amazing how tough and attractive they are!

Growth is fast?  The purchase size is less than 1 meter.
 

Microspadix do you think it is less tolerant?

7 hours ago, palmsOrl said:

Here's my contribution.  Likely Veitchia subdistichia.

Beautiful but -8°C (17°F) is WAY too cold for that particular palm.  

Another option, not a palm tree, is Musa Basjoo, it grows very fast although it would be destroyed by the cold for 4 months a year.

I've seen some thin trunked Sabals all around town lately and they are growing on me.  Viewing Palmpedia they could be Sabal pumos or rosei but really not sure.  Palmpedia says the trunks of either gets between 13-35 cm.   Sabal rosei is said to be more cold tolerant.