Incrediball' produces flowers that open green, then mature to white before fading to green again. Will reach 4-5' tall and wide.
Sister Theresa' produces massive, true-white blooms. It will grow to be 4-5' tall and wide at maturity.
Blue Billow' produces blue, lace-cap flowers against dark-green foliage. Profuse bloomer. Grows 3-4' tall and 4-5' wide.