Blackhaw viburnum is a North American species of shrub in the moschatel family. Rarely taller than 10 feet (3 m), it is notable for its intensely black fruits which ripen in late summer and persist into the winter. The species is dioecious, meaning that male and female flowers occur on separate plants.
Related plant:
Rusty Blackhaw Viburnum
About soil condition, blackhaw viburnum grow best in average to equal parts of sand, silt, and clay. The soil should be moist but well-drained and slightly acidic. They will tolerate some shade, but too much shade will produce fewer flowers.
Not too different with other plants, the Blackhaw viburnum requires a certain amount of sun each day in order to grow and thrive. This native North American shrub prefers full sun to partial shade, meaning it should receive at least six hours of direct sunlight each day. While it can grow in shadier spots, it may not produce as many flowers and fruits in these conditions. So if you're hoping for a bountiful harvest of berries, make sure to plant your Blackhaw viburnum in a sunny spot.
The temperature condition that is most ideal for the blackhaw viburnum is a temperature that is between 68 and 72 degrees Fahrenheit. This temperature range is ideal because it allows the plant to properly flower and produce fruit. When the temperature is too cold or too hot, the plant will not be able to produce as much fruit. The blackhaw viburnum is a hardy plant, so it can tolerate some variation in temperature, but it will not produce as much fruit if the temperature is outside of its ideal range.
Ideal humidity condition for this plant is 50% and above. Blackhaw viburnum will do best in bright, indirect light but can tolerate low light conditions. It is a fast grower and can reach up to 15 feet tall. This shrub does best in moist, well-drained soil.
About fertilizer, this kind of plant doesn't need too much. In fact, too much fertilizer can actually do more harm than good. A general-purpose fertilizer with an NPK ratio of 10-10-10 or 12-12-12 is fine. Apply it once a year in early spring, before new growth begins. As for the roots, blackhaw viburnum has shallow roots, so be careful when you're doing any kind of gardening or landscaping near it. If you have to dig around the roots, do so carefully and avoid damaging them.
Pruning is an important part of keeping your blackhaw viburnum healthy and looking its best. Prune in early spring, before new growth begins. Remove any dead, diseased, or damaged branches, as well as any branches that are crossing or rubbing together. Thin out the canopy to allow light and air to reach the inner branches. Cut back any long, leggy branches to encourage new growth.
Propagation is generally by seed, which can be collected from the wild or grown in a home garden. Blackhaw viburnum can also be propagated by softwood cuttings taken from new growth in late spring or early summer.
Usually, the plant growth rate is between 24 and 36 inches per year. The height and spread of a blackhaw viburnum can range from 6 to 12 feet, with some varieties reaching up to 18 feet tall. Blackhaw viburnum is a deciduous shrub, meaning it will lose its leaves in the fall.
Common problems for this kind of plant are powdery mildew, rust, and leaf spot. These can all be controlled with a fungicide. If you see any of these problems, treat the plant with a fungicide as soon as possible.
Source:
Blackhaw Viburnum | Natural Resource Stewardship
Blackhaw Viburnum (Viburnum prunifolium)-Hort Answers
Blackhaw Viburnum (Viburnum prunifolium) - Selecting Shrubs for