Tree Acer buergerianum [Trident Maple] Needs training to develop single central leader (if that is desired). Popular street tree in Japan. Cold hardiness varies in seed produced stock. In some cases, fruit set is so high as to deplete foliage. Flaking bicolor bark in gray-brown and orange.
Tree Acer × freemanii [Freeman Maple] Stemming from its Silver Maple parentage, this hybrid is an extremely fast grower and tolerant plant, able to withstand drought conditions and heavy soils, which the Red Maple, its other parent, cannot. However, the Freeman Maple has more of the strength in wood of the Red Maple.
Tree Acer × freemanii 'Armstrong' [Armstrong Red Maple] The Armstrong Red Maple is a cross between Acer rubrum and Acer saccharinum and is known for its columnar habit and brilliant red to red-orange fall coloration. This species has the durability of the Silver Maple and can tolerate urban conditions. The root system is less aggressive, though, so it can be planted as a street tree.
Tree Acer × freemanii 'Celzam' [sold as Celebration®] [Celebration Freeman Maple] 'Celzam' has a classic upright form with uniform growth, making for a great specimen tree in the landscape. This plant, like most Freeman hybrids, is generally seedless and is also known for its fall color. In early October, 'Celzam' becomes a brilliant red and then slowly changes to gold by late October.
Tree Acer × freemanii 'Scarsen' [sold as Scarlet Sentinel®] [Scarlet Sentinel Freeman Maple] This cultivar is a cross between the Red Maple and the Silver Maple, though it's leaves and bark more closely resemble the Silver Maple. It is one of the most adapted maples for southern regions of the country. 'Scarsen' is known for its colorful yellow-orange to orange-red fall foliage and columnar growth form.
Tree Acer glabrum [Rocky Mountain Maple] This species can withstand moderate drought and coarser soils better than other maples, but prefers moist soils that are sligthly acidic.
Tree Acer grandidentatum 'Schmidt' [sold as Rocky Mountain Glow®] [Rocky Mountain Glow Maple] Acer grandidentatum is closely related to Acer saccharum (the Sugar Maple), which it is often compared to. This variant stands out due to its more upright form, smaller size, and its brilliant orange-yellow and orange-red fall foliage.
Tree Acer griseum [Paperbark Maple] Slow growth (6-12" per year) is compensated for by longevity and freedom from maintenance. The cinnamon-brown, curly bark is outstanding. Habit is open enough to display bark interest year-round.
Tree Acer × 'Hipzam' [sold as Highland Park®] [Highland Park Bigtooth Maple] Acer grandidentatum is closely related to Acer saccharum (the Sugar Maple), which it is often compared to. 'Hipazam', often sold under the name of Highland Park, is an upright variant with an oval crown and lustrous, deep green leathery leaves that turn an attractive orange-red in autumn.