Will they flower and last in zone 3..northern Minnesota
The Missouri Botanical Garden says Schizanthus pinnatus is hardy to zone 2. It flowers in spring and will do best if it gets protection from hot afternoon sun. Other sources list it, and S. wisetonensis as annuals. The later blooms in summer. Check with the seed company but I wouldn't count on it acting as a perennial. It may self-sow and come back that way.