DAVID AND ALAN has proven to have some tenderness problems in unprotected places exposed to sub-zero temperatures. It survives near the shore of Lake Champlain in Vermont, zone 5a, but died a few miles inland, zone 4. It has survived in a zone 4 garden in Iowa. It died in Wichita, KS during a sub-zero period. It thrives in Maryland, zone 6 or 7, and naturally, its behavior is exemplary in St. Louis, where it was bred. It is a wonderful parent, increases by proliferations on established scapes, and seems to reward full-sun placement with vigorous growth and very showy bloom. I'm very proud of it, despite the tenderness in frigid places.

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