Acer palmatum 'Emperor I' (Emperor I Japanese Maple)
A fine newer cultivar distinguished by its bright red foliage. Whereas the more widely available cultivar, 'Bloodgood' has a maroon color, this one is redder, especially when the sun shines through the leaves. Hardy - leaves emerging two weeks later than 'Bloodgood'. Milwaukee, WI city arborists consider 'Emperor I' hardy within their urban area.
Acer palmatum 'Red Dragon' (Red Dragon Japanese Maple)
Unlike most "red" selections that are in fact purple this is more true red. Its color remains vibrant throughout the summer. Smaller than most dissectums, with black bark and a slower growth habit, this maple is a good choice for bonsai or a container.
Acer palmatum 'Tamuke yama' (Tamuke yama Japanese Maple)
Although not as lacy or fast growing as some clones, this laceleaf maple holds its dark purple-red leaf color better than others and is especially vigorous in hot climates. Spring color is crimson and fall color is scarlet.
Acer palmatum 'Twombly's Red Sentinel' (Twombly's Red Sentinel Maple)
This Ken Twombly introduction has a unique narrow upright shape, attractive in many situations where space is limited, particularly close to a building or walkway. Plants in our landscape are more appealing with each passing season. It remains a strong maroon color all summer long here in NW Oregon.
Acer palmatum var. atropurpureum (Red Japanese Maple)
One-year plants are perfect for re-potting to grow on for a season; transplants are best for prompt resale. For best branching, lightly pinch the stem tips when they're in tender new growth. An inexpensive alternative to grafted varieties, they are often sold in the GC in a #1 or #2 pot.