Listed as 9b: Pinanga Coronata & Gaussia Maya

[Sandy Loam]

Dave's Garden lists Pinanga Coronata & Gaussia Maya as USDA zone 9b palms.  Has anyone had success in growing these in Zone 9a?   

[topwater]

I have a couple I'm going to plant this spring in zone 9b TX where I suspect they will be marginal at best.  I assume that they will freeze back sooner or later, but I gather that they will come back from a freeze once they are established, or so I hope!  I've heard P. coronata and P. kuhlii are the cold hardiest of the pinangas, and they both look to be good clumpers, so I'm optimistic. 

[Eric in Orlando]

They are both borderline 9b/10a palms. Pinanga coronata with freeze back below around 28-29F but usually comes back. This is the form with the evenly spaced leaflets. The form wiith the unevenly spaced leaflets is more tender and dies back around 30F. Even the folaige is more tender and often shows burn below around 37-38F. This was formerly known as P. kuhlli but has been recently lumped into P. coronata.

Guassia maya surprisingly handles some cold but no frost. It gets killed below about 27F.

 

[topwater]

So would this be the evenly spaced leaflets?  The ones sold to me as kuhlii still have bifid leaves so I can't compare the two. 

[Alberto]

And what is a Pinanga kontumensis? Zone 9a ????  http://www.trebrown.com/palms_arecaceae.php

So much different names with some chance of thriving in cooler climates.....

[Cikas]

6 hours ago, Alberto said:

And what is a Pinanga kontumensis? Zone 9a ????  http://www.trebrown.com/palms_arecaceae.php

So much different names with some chance of thriving in cooler climates.....

That list is far from accurate. All palms on that list are actually 1 USDA zone less hardy in reality.

Soo USDA 8b on that list is USDA 9a in reality, USDA 9a is 9b, and USDA 9b is USDA 10a ect..

Basically every palm on that list is actually more cold sensitive than stated on that list.

[Ben in Norcal]

7 minutes ago, Cikas said:

That list is far from accurate. All palms on that list are actually 1 USDA zone less hardy in reality.

Soo USDA 8b on that list is USDA 9a in reality, USDA 9a is 9b, and USDA 9b is USDA 10a ect..

Basically every palm on that list is actually more cold sensitive than stated on that list.

I think it's more nuanced than that.  Some are clearly accurate (e.g. A. cunninghamiana is a pretty bulletproof 9b palm).