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Geoff's article is excellent...but doesn't include the most recently described species...Dioon argenteum---many consider this silvery hirsute beauty from Oaxaca to be "best in show". It is the fatest growing of all the dry adapted dioons from southern Mexico and is invariably the garden favorite. Dioon stevensonii---formerly regarded as a type of D. tomasellii back in the days when D. sonorense (note spelling) was merely a variety of D. tomasellii. Dioon stevensonii, from Michoacan and Guerrero, is a smaller version of D. t. in all aspects and has red emergent leaves.
Only 11 years from seed, to coning..? Cycads never seem to be that fast. But I have only witnessed Sagos...not Dioons,... in the subtropics. Are you sure that it is just not going to do a "frogger" (Croak)...? Amazing. Thanks for the further input on Dioons.
