Answer: HELIOPSIS scabra Summer Sun - Rough Heliopsis - grows about 36" tall and 24" wide. From mid summer into fall this plant produces a seemingly never ending supply of yellow, semi-double flowers. The 3" flowers are on long stems good for cutting. Since the plant doesn't really begin growing until after the iris are up, it should not stop your iris from blooming or overcrowd the bed. By the time your iris are finished blooming, the Heliopsis should just be beginning to spread. I'd put them both in the same bed, but do give each enough room to spread out so you can enjoy the blooms on both. Enjoy your garden!
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