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Re: cordylines and cool summers
Posted by Brandt-San Diego on 5/25/2017, 2:38 am, in reply to "cordylines and cool summers"
My book Trees of New Zealand says that Cordyline australis grows to about 2500 feet elevation, which is generally pretty chilly, and it grows to the south tip of the South Island as well. Cordyline indivisa grows to 4000 feet above sea level, which is timberline even in the North Island (and I remember seeing it growing right up to the edge of the treeless alpine environment when I visited in 2005). Hence, the NZ Cordylines tolerate a lot of chilly summer weather in their mountains due to being surrounded by a lot of cool ocean and the rarity of significant warm air masses aloft (even if winters are reasonably mild)--the reason for the very low (3000-3500 ft South Island, 4000 ft North Island) timberlines (generally found where the average temp in the warmest month is 50 F).