Answer: Stigmaphyllon, or orchid vine, is a summer-bloomer, producing single yellow flowers. It will come into glory after the wisteria stops blooming. It needs well-draining soil, rich in organic matter, and requires regular watering throughout the growing season. Flame vine (Pyrostegia) is a rampant grower (choose this plant only if you have lots of room)and blooms most profusely during the winter months. It isn't fussy about soil but needs full sunshine and moderate water throughout the growing season. Queen's Wreath (Petrea volubilis) is a twining vine native to Mexico. The floral display comes in late spring through early summer, with flower clusters about the same shape and color as your wisteria. I'd choose the orchid vine as a companion to the wisteria. The growing conditions are similar, but the flower size, shape and color are different, which will give your garden a whole new look as the seasons change.
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