Trithrinax

[PalmGuyWC 1,482]

No one has reported on Trithrinax yet.  It's no secret that they are extreamly cold hardy and will take the mid teens but one of mine is getting cold tested for the first time.  That is T. biflabellata. (aka, schizophylla)  It's the dwarf of the group.  Mine is 17 years old and only about 3.5' in heigth and has 6 heads.  It's growing in an exposed area and looks fine after 23F. It was covered with white frost many nights this year.  No damage what so ever, and appears to still be slowly growing through this misserable winter.

My other two species are T. campestris and acanthocoma (aka. brasiliensis), both very hardy.

Dick

[Gaston in Argentina 8]

Heres a picture of two single trunked Trithrinax biflabellata that have lost the fibre on their trunks.-

Cheers. Gaston

[STEVE IN SO CAL 14]

Two plants, 5 gal size

15 f, 13 hrs below freezing first night, thereafter too depressed to check my hi/lo. 5 nights into the hi teens/low twenties for sure, many hours below freezing

Unfazed (pushed some ugliness this summer, but that was it)

[Dave-Vero 656]

My Thrinax radiata, about six feet tall and forming part of the "canopy" of a thicket of young palms and heliconias, looks unfazed after 9:30 pm to dawn at 32-31 degrees, falling to 30 at dawn. Dry air, no frost.

[tank 241]

Low of 14F. 14 days straight of below freezing temps. 0% overhead protection. 2 ft Thrinax schizophylla is dead.

Several in pots with overhead protection appear to be recovering. Bit of a disappointment.

[Austinpalm 175]

I have all 3 species in 1-2 gallon sizes under live oak canopy. During the worst night (16F) I protected all with a plastic pot. Other nights lows in the upper 20's and lower 30's they received no protection other than the canopy. No damage to any of the plants.

[blake_tx 8]

Trithrinax acanthacoma in ground, 3 ft of trunk 14f, no damage. Super Hardy!!

[TexasColdHardyPalms 3,174]

T. Campestris:

Tiny 4" liners - 17 degrees without snow or ice, just fine, no spear pull on any plants. No burning of the leaves.

50 days later the same Tiny 4" Liners - 4 days in a row covered with ice and snow highs 32-36degrees, lows around 24-28 spear pull on 50% of the plants with bronzing of most of the leaves. 85% of the plants pushed new spears. 15% of them died. This is from a sample of 62 plants.

2G - no spear pull during either event and very minimal bronzing. Absolutely no overhead protection whatsoever.

Note that I lost 30% of the 2G serenoa repens sitting 3' from the campestris.

I have a few that will be 5G size this winter and will test them again. I believe a 5G up to mature specimen in the ground would be 100% hardy in North Texas 8A.

[Austinpalm 175]

Same three plants reported above in 2010 (10- gallon sized)  withstood approximately 24 hrs below freezing with an ultimate low of 20F with no damage under oak canopy.