I was interested in trying out buffalo grass (Buchloe dactyloides) ‘Legacy’ from High Country Gardens. I was wondering if you knew anyone who has tried growing it in the PNW (esp. Whidbey Island) and what they thought of its performance.
According to the Sunset Western Garden Book, buffalo grass is best suited to Sunset zones 1-3, 10, and 11. Whidbey Island is Sunset zone 5. While the Sunset book does not address ‘Legacy’ in particular, you may find that this grass is not the best choice for your location.
The Washington State Extension in Puyallup created a ranked list of good turf cultivars for Western Washington.
Additional information, from the Extension, about lawns. Note that there is an article about buffalo grass, but it is focused on whether that grass will do well in Central Washington, not Western Washington.