Hardiness of various Dioons(Sonorense/Vovidesii, Caputoi, etc.)

[Meangreen94z]

Hello. There seems to be a decent amount of information on hardiness for common Dioon such as Edule and Spinulosum, but any experience or reference on the more uncommon? Sonorense/Vovidesii, Caputoi, Merolae, Califanoi, Purposii, Mejiae, etc.? Thanks 

[Merlyn]

Here's the notes I have on them:

Dioon Edule: 19F range for caudex death, full sun to light shade

Dioon Spinulosum: 23-26F damage, dead @ 20F, full sun ok in FL but lighter green, prefers medium shade

Dioon Mejiae: ok >25F but not too frost-hardy, takes significant frond damage.  Part sun to 50% shade

Dioon Merolae: low 20s tolerant but not quite as tough as Edule.

Dioon Rzedowski: good to low 20s (ok in Tallahassee), part shade to nearly full sun in FL

Dioon Angustifolium: similar to Edule, low 20s ok

Dioon Califanoi: 23-26F death? Hardier than Spinulosum and Mejiae?

I won't guarantee accuracy on any of the above... 

[Meangreen94z]

Thanks

[TexasColdHardyPalms]

Califanoi, Caputoi, Argenteum and Purpusii are leaf hardy to low 20's and like every cycad the larger the caudex the hardier they are.  Mejiae and merolae aren't very hardy and rzedowski is a cold hardy wimp like spinulosum and won't make it for most of Texas. 

Angustifolium will burn the leaves around 15.  Most edule types won't burn the leaves but will straight die around 10F.   Holgremnii have been in the ground here for a few years.  Some burn at 23, some not until 20F. But I've never lost one in the ground yet.

Overall Califanoi is proving to be the second hardiest species aside from the Edule bunch.

[Meangreen94z]

Thanks. I would figure Sonorense/ Vovidesii would atleast be hardy to low 20’s? I’ve heard potentially hardier given its locality in the mountains.

[TexasColdHardyPalms]

I would think but I havent tested them. 

[Meangreen94z]

Thanks.

[GeneAZ]

This E. sonorense had zero damage at 26F for four nights in a row.

[TexasColdHardyPalms]

ill have some more data after these last two mornings of 22F and insane wind.  

[Meangreen94z]

That’s an impressive trunk, very nice

[Meangreen94z]

Anyone else with experience? Thanks