Tree InvasiveThis plant is considered invasive Acer platanoides [Norway Maple] One of the densest shade trees, widely adaptable to soils and environments, including dry and polluted city conditions. Transplants easily. Extremely dense canopy and shallow root system make it impossible to maintain good turf beneath. Can be a weed problem, especially in cooler parts of the northeast US. Slight susceptibility to verticillium wilt, anthracnose, and leaf scorch. Can be damaged by 2,4-D drift. Does not perform well in southern US (warm nights severely retard growth).…
Tree InvasiveThis plant is considered invasive Acer platanoides 'Columnare' [Columnar Norway Maple] This cultivar is easy to transplant and is tolerant of different soils. The Columnar Norway Maple is more adaptable to drought than other Maples. Pollution tolerant. When Norway maple escapes cultivation and invades natural areas it reduces species richness and native tree regeneration by out-competing other trees and understory species for resources, creating dense shade canopies, and spreading rapidly through high seed production. It also releases toxins that reduce the growth and reproduction of native…
Tree InvasiveThis plant is considered invasive Acer platanoides 'Crimson King' [Crimson King Norway Maple] Crimson King is a common cultivar used in the industry for its rich maroon foliage throughout the growing season. One of the densest shade trees, widely adaptable to soils and environments, including dry and polluted city conditions. Transplants easily. Extremely dense canopy and shallow root system make it impossible to maintain good turf beneath. Slight susceptibility to verticillium wilt, anthracnose, and leaf scorch. When Norway maple escapes cultivation and invades natural areas it reduces species…
Tree InvasiveThis plant is considered invasive Acer platanoides 'Emerald Queen' [Emerald Queen Norway Maple] This cultivar has ascending branches and an oval habit. Best selection of Norway Maples for urban sites. Fast growth rate and shallow root system. Brilliant yellow in the fall. When Norway maple escapes cultivation and invades natural areas it reduces species richness and native tree regeneration by out-competing other trees and understory species for resources, creating dense shade canopies, and spreading rapidly through high seed production. It also releases toxins that reduce the growth and…
Tree InvasiveThis plant is considered invasive Ailanthus altissima [Tree of Heaven] Unusual form and texture not unlike a large sumac. Highly adaptable. Tolerates salt spray. Dioecious. Coarse and inclined to drop twigs. Male flowers are malodorous; female plants make many weed seedlings. Ailanthus altissima forms dense, clonal thickets which displace native species and can rapidly invade fields, meadows, and harvested forests. This invasive tree species is extremely tolerant of poor soil conditions and can even grow in cement cracks. Ailanthus altissima is not shade tolerant, but…
Liana InvasiveThis plant is considered invasive Ampelopsis glandulosa var. heterophylla [Porcelain Ampelopsis] Best fruiting in full sun. Restricting root growth can enhance fruit production. Japanese beetles love them. Can be invasive. Rampant growth.
Shrub InvasiveThis plant is considered invasive Berberis thunbergii [Japanese Barberry] An adaptable plant that does well in an urban environment. Can be coppiced, with the resulting new growth developing better summer color. Can be pruned to ground every 5 to 7 years. Relatively trouble-free. Berberis thunbergii invades a variety of habitats from shaded woodlands to open fields and wetlands. Berberis thunbergii is rapidly spread by birds that eat the berries thus dispersing the seeds.
Shrub InvasiveThis plant is considered invasive Berberis thunbergii 'Bogozam' [sold as Bonanza Gold™] [Bonanza Gold Japanese Barberry] 'Bogozam' is noted for its golden yellow leaves and compact, dwarf habit. An adaptable plant that does well in an urban environment. Place in a high light location for best foliage coloration. Can be coppiced, with the resulting new growth developing better summer color. Can be pruned to ground every 5 to 7 years. Relatively trouble-free.
Shrub InvasiveThis plant is considered invasive Berberis thunbergii var. atropurpurea [Purple Japanese Barberry] This variety has purple to red summer foliage, turning a rich red to red-violet in the fall. It is an adaptable plant that does well in an urban environment. Place in a high light location for best foliage coloration. Can be coppiced, with the resulting new growth developing better summer color. Can be pruned to ground every 5 to 7 years. Relatively trouble-free.
Shrub InvasiveThis plant is considered invasive Berberis thunbergii var. atropurpurea 'Crimson Pygmy' [Red Dwarf Japanese Barberry] The Red Dwarf Japanese Barberry is exceedingly popular due to its dense, low growing form, brilliant foliage, and tolerance to tough urban conditions. For the best leaf coloration, place in full sun. This plant tolerates dry soils, but will suffer in wet, poorly drained soils.
