Viburnum nudum 'Winterthur'
Possum Haw, Swamp Haw, Possum Haw Viburnum
Possum Haw, Swamp Haw, Possum Haw Viburnum
Type Shrub, woody plant
Hardy range 5A to 9A
Height 4' to 6' / 1.20m to 1.80m
Spread 4' to 6' / 1.20m to 1.80m
Growth rate Average
Form Rounded
Exposure Partial shade or partial sun to full sun
Persistence Deciduous
Hardy range 5A to 9A
Height 4' to 6' / 1.20m to 1.80m
Spread 4' to 6' / 1.20m to 1.80m
Growth rate Average
Form Rounded
Exposure Partial shade or partial sun to full sun
Persistence Deciduous
Bloom Color White
Bloom Time Spring
The flowers are fragrant and showy.
Bloom Time Spring
The flowers are fragrant and showy.
Environment
This plant tolerates drought, occasional wetness and some salt.
This plant will grow in very dry to occasionally wet soil.
Suitable soil is well-drained/loamy, sandy or clay.
The pH preference is an acidic to slightly alkaline (less than 6.8 to 7.7) soil.
This plant tolerates drought, occasional wetness and some salt.
This plant will grow in very dry to occasionally wet soil.
Suitable soil is well-drained/loamy, sandy or clay.
The pH preference is an acidic to slightly alkaline (less than 6.8 to 7.7) soil.
Leaf Color Green
Fall Color Purple and red
This plant has attractive foliage and attractive fall colors.
Fall Color Purple and red
This plant has attractive foliage and attractive fall colors.
Culture Notes
Viburnum nudum 'Winterthur' has received the Gold Medal Award from the Pennsylvania Horticultural Society. It likes moist, acid soil and will do very well in a wet site. Fall color is best when planted in full sun. Another viburnum nudum is needed for cross-pollination if the attractive fruits are to develop. They appear in clusters and will change from pink to dark blue. Plants appear more open than other viburnum shrubs. Some stems can be cut near to the ground every year to keep the plant small. Foliage is shiny bright green. This plant is considered mostly allergy free and causes little or no allergy problems in most people.
Planting and establishing shrubs
The most common cause of young plant failure is planting too deep. Plant the root ball no deeper than it was in the nursery. In most instances, the root flare zone (point where the top-most root in the root ball originates from the trunk) should be located just above the landscape soil surface. Sometimes plants come from the nursery with soil over the root flare. If there is soil over this area, scrape it off. The planting hole should be at least twice the width of the root ball, preferably wider. In all but exceptional circumstances where the soil is very poor, there is no need to incorporate anything into the backfill soil except the loosened soil that came out of the planting hole. Never place ANY soil over the root ball. If a row or grouping of plants is to be installed, excavating or loosening the soil in the entire bed and incorporating organic matter enhances root growth and establishment rate.
Weed suppression during establishment is essential. Apply a 3-inch thick layer of mulch around the plant to help control weed growth. Keep it at least 10 inches from the trunk. If you apply it over the root ball, apply only a one or two inch layer. This allows rainwater and air to easily enter the root ball and keeps the trunk dry. Placing mulch against the trunk or applying too thick a layer above the root ball can kill the plant by oxygen starvation, death of bark, stem and root diseases, prevention of hardening off for winter, vole and other rodent damage to the trunk, keeping soil too wet, or repelling water. Regular irrigation through the first growing season after planting encourages rapid root growth, which is essential for quick plant establishment.
Viburnum nudum 'Winterthur' has received the Gold Medal Award from the Pennsylvania Horticultural Society. It likes moist, acid soil and will do very well in a wet site. Fall color is best when planted in full sun. Another viburnum nudum is needed for cross-pollination if the attractive fruits are to develop. They appear in clusters and will change from pink to dark blue. Plants appear more open than other viburnum shrubs. Some stems can be cut near to the ground every year to keep the plant small. Foliage is shiny bright green. This plant is considered mostly allergy free and causes little or no allergy problems in most people.
Planting and establishing shrubs
The most common cause of young plant failure is planting too deep. Plant the root ball no deeper than it was in the nursery. In most instances, the root flare zone (point where the top-most root in the root ball originates from the trunk) should be located just above the landscape soil surface. Sometimes plants come from the nursery with soil over the root flare. If there is soil over this area, scrape it off. The planting hole should be at least twice the width of the root ball, preferably wider. In all but exceptional circumstances where the soil is very poor, there is no need to incorporate anything into the backfill soil except the loosened soil that came out of the planting hole. Never place ANY soil over the root ball. If a row or grouping of plants is to be installed, excavating or loosening the soil in the entire bed and incorporating organic matter enhances root growth and establishment rate.
Weed suppression during establishment is essential. Apply a 3-inch thick layer of mulch around the plant to help control weed growth. Keep it at least 10 inches from the trunk. If you apply it over the root ball, apply only a one or two inch layer. This allows rainwater and air to easily enter the root ball and keeps the trunk dry. Placing mulch against the trunk or applying too thick a layer above the root ball can kill the plant by oxygen starvation, death of bark, stem and root diseases, prevention of hardening off for winter, vole and other rodent damage to the trunk, keeping soil too wet, or repelling water. Regular irrigation through the first growing season after planting encourages rapid root growth, which is essential for quick plant establishment.
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