"Challenger" (Stout 49) Extra tall, medium red flower of modest size. High bud count and candelabra branching coupled with its very late season makes it a welcome addition to the garden. An altissima hybrid that is reported to be a rebloomer. H.M. Award. This amazing old Stout hybrid sends flowering scapes to six feet before opening in midsummer. Each stem is home to clusters of large spidery, bright red flowers. In my garden it blooms from late July until mid August.