Answer: Plant maturity and good cultural care are the keys to berry set in Nandina. Flowering is a good sign - without flowers, you'll get no berries. Failure of the flowers to open could be a result of plant immaturity or stress (recent transplanting, drought, etc.) Now that your plant has been in its garden site for over a year, it should open those blooms. Nandinas seem to produce berries most abundantly when there is a grouping of the plants, rather than a single specimen. Though the plants are self-fertile, they are at their best when cross-pollinated. If your nandina doesn't bloom for you this year, try planting in a group (3 or more shrubs). If that doesn't work, you can introduce a different variety of nandina to assure berry production.
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