Answer: You're correct that Celastrus has separate male and female plants and that it takes one of each for the female to produce berries. The plants may have been mislabeled at the nursery and you may have two females instead of one of each. The flowers of the bittersweet are very small, but you should be able to tell the difference by comparing them under a magnifying glass. The male flower will have slender filaments with pollen-laden pads at the ends. The female flower will have a long stigma protruding from the center of the flower and a swollen ovary at the base of the flower. If flowers from both bittersweets look identical, you'll need a plant of a different gender before you'll get berries.
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