Group: Dissectum (very deeply divided and dissected)
Height: 12-15 ft. (3.6-4.7 m) 15-20 ft. (4.7-6 m)
Spacing: 10-12 ft. (3-3.6 m) 12-15 ft. (3.6-4.7 m)
Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Sun to Partial Shade Light Shade
Other details: Average Water Needs; Water regularly; do not overwater Provides winter interest
Soil pH requirements: 5.1 to 5.5 (strongly acidic) 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic)
I planted this tree 4 yrs ago and it has survived hot dry Utah summers with no additional watering and a cold winter. It has grown a foot to reach 6'. The flowers' stems are a pretty pinkish red that contrast with the yellow-green leaves beautifully. I really like that it is an upright and green laceleaf. It is sensitive to wind so it needs a sheltered spot. I have mine tied to two bamboo stakes for additional support. Not common around here which (IMO) is a plus; the only other specimen I have seen is a ~20 foot tree at a home higher up in the foothills where there is significantly more snow than at my place (zone 5-6 depending on where you are in the Salt Lake valley).
This variety of Japanese Maple seems to be negatively affected by strong sun and/or heat as well as winds. My tree, planted in 2006, reacted to a 2008 hot spell with leaves that shriveled up and died. Though it was quick to send out new growth back then, about half of the tree now appears to be dead in April (Zone 5B). There are new leaf buds emerging only on about half of the tree, so maybe it's susceptible to cold winters too.
On Jun 29, 2008, hunter_gardener from Fort Worth, TX wrote:
My two year old potted Seiryu looked great this spring, but a very hot dry spell with high winds caused the leaves to all dry out and fall. But, a couple of weeks later, it is putting on new leaves and seems like it will make a full recovery. (I also moved it to a spot with more shade to protect it during the scorching summer heat.)
I grow this tree in a pot on a South-facing terrace on the top floor of a 9 story building, and it has performed very well since bought at a nursery 2 years ago. The foliage is beautiful spring through fall and more profuse than other acer's I see in my area.
On Mar 4, 2005, Todd_Boland from St. John's, NL (Zone 5b) wrote:
This is becoming a very popular cultivar and rightly so. This Dissectum Group maple is unusual in having an upright habit rather than a mounding, semi-pendulous habit. Spring leaves are green with reddish tips. Fall colour is yellow with a flush of red or orange. It is a vigorous grower and may reach up to 7 m in a very fertile area.
This plant has been said to grow in the following regions:
Mentone, Alabama San Anselmo, California Georgetown, Kentucky Louisville, Kentucky Dearborn Heights, Michigan Verona, Mississippi New York, New York Half Moon, North Carolina East Norriton, Pennsylvania Elgin, South Carolina Walhalla, South Carolina Plano, Texas Richland Hills, Texas Salt Lake City, Utah Disputanta, Virginia Lexington, Virginia