Q.Pernettya Mucronata Produces Flowers But Not Berries
Every year this plant grows well and produces lots of small white bell shaped flowers in may but they never produce the pink berries that the plant was full of when I bought it. It is now 4 years old.
Certified GKH Gardening Expert
Check your growing conditions. They need acidic soil, plus fertilizer for acid-loving plants like rhododendrons. And if you only have one shrub, it needs a pollinator. These shrubs are dioecious, only have male or female flowers, so you need the other to produce berries. You may want to contact the garden center where you bought it and see if the cultivar name indicates whether it is male or female and if they have a compatible cultivar for fruiting.
https://www.gardeningknowhow.com/ornamental/shrubs/pernettya/growing-pernettya-plants.htm