Yes, you need two arrowwood viburnums to get berries. One plant alone will flower but won't set fruit. NC State Extension confirms you need at least two different genetic strains to produce berries on this shrub. No second plant means no berries, no matter how healthy your single shrub looks.
I learned this the hard way. I planted a single arrowwood viburnum and waited three years for berries that never came. The plant looked great, bloomed each spring, and then dropped every flower without a single berry forming. I added a Blue Muffin cultivar about 40 feet away from my first plant. The very next season, both shrubs were loaded with dark blue fruit. The cross-pollination between two plants made all the difference.
Arrowwood viburnum cross-pollination needs plants with different DNA to work. Two plants from cuttings of the same parent share identical genes. They can't pollinate each other. You need plants from different parent stock for the pollen to work. Two different named cultivars or two seedling-grown plants will both do the job.
NC State Extension puts it this way: arrowwood viburnum requires more than one genetic strain to make fruit. This means your local nursery selling clones of the same mother plant won't solve the problem. Ask the staff if they carry two different cultivars or if the plants were grown from seed. Seed-grown plants have unique genetics and can cross-pollinate with each other.
Spacing matters for your pollinators to do the job well. Keep your two plants within 50 feet (15 meters) of each other. Bees fly between the flowers and carry pollen from one plant to the other. If you space them too far apart, fewer bees make the trip, and you'll get less fruit set on both plants. Closer is better, but don't crowd them so tight that airflow suffers.
Your arrowwood viburnum fruit production goes up with more plants in the area. Two shrubs give you a good start. Three or four give even better results because more pollen moves around during bloom. In my garden, adding a third cultivar boosted berry counts on all three plants by about 30% compared to when I had just two.
Plan for arrowwood viburnum fruit production from the start by buying two different cultivars at the same time. Plant them in your yard with good sun and the right soil. Within two to three years, you'll have clusters of dark blue berries that draw in dozens of bird species each fall.
The birds are the best payoff of getting this right. In my experience, a fruiting arrowwood viburnum brings in more bird species than any other shrub in my yard. I've counted cedar waxwings, robins, bluebirds, and thrushes all feeding on the same two plants in one week. Watching a flock of waxwings strip your viburnum clean in one afternoon makes all the planning worth the effort. Buy two plants, space them right, and you'll be glad you did.
Read the full article: Arrowwood Viburnum: Complete Growing Guide
