Scientific Name:
Acer palmatum
Atropurpureum Group
Pronunciation:
AY-sur pal-MAY-tum
Common Name:
red-leaf Japanese maple
Family Name:
Sapindaceae
Plant Type:
Tree - deciduous
Key ID Features:
Stems new growth purple; leaves opposite, most blades orbicular, 4-10cm wide, palmately veined with 5-7 serrate lobes, simple, red-purple (some cvs. turn dark green in full sun by mid-summer). Winter ID: buds, ovoid, have light brown hairs on a papery sheath that extends halfway up.
Habit:
Spreading, Upright
Form:
Round
Texture:
Medium - fine
Mature Height:
5 - 7m
Mature Spread:
7 - 10m
Growth Rate:
Slow
Origin:
Garden origin, S.E. Asia / Japan / China
Hardiness Rating:
Zone 6: (-23 to -18 °C)
Exposure:
Part sun/part shade
Soil/Growing Medium:
Acidic, Well-drained
Water Use:
Moderate
Landscape Uses:
Fall interest, Specimen plant, Summer interest
Additional Info:
Google. Foliage of some cultivars may turn dark green in summer in full sun, and A. 'Shindeshojo' has bright pinkish-red spring foliage.
Leaf Morphology:
Form:
Simple, Lobed
Arrangement:
Opposite
Texture/Venation:
Soft flexible, Palmate venation
Surfaces:
Glabrous
Colour in Summer:
Dark-green, Red, Dark-red
Colour in Fall:
Orange, Red
Shapes:
Ovate
Apices:
Acuminate
Bases:
Hastate
Margins:
Double serrate
Additional Info:
Spectacular fall colour, 4 - 12cm long
Inflorescence Type:
Cyme, Corymb-like
Flower Morphology:
Flowers perfect
Number Of Petals:
5
Corolla Shape:
Rotate/stellate
Ovary Position:
Superior
Colour (petals):
Not showy, Dark-red
Flower Scent:
None
Flower Time at Peak:
Apr
Fruit Type:
Samara, Schizocarp
Fruit Colour:
Dark-red
Fruiting Time:
Sep, Oct
Additional Info:
Schizocarps split into samara-like mericarps after dispersal
Bark Morphology:
Smooth, Lightly fissured
Bark or Stem Colour:
Grey, Red
Leaf Bud Type:
Ovoid
Leaf Scar Shape:
Crescent shaped
Propagation:
Seed, Softwood cuttings, Grafting
Pest Susceptibility:
Anthracnose, Beetles or weevils, Canker or sap rot, Caterpillar or cutworm, Dieback, Fungal leaf spot, Mildew, Mites, Scale insects, Stem borer insects, Wilt (Pest resistant, Disease resistant, Deer resistant, Rabbit resistant)
Course(s):
- AARB 1012
- HORT 1155
Location(s):
- (BUG) BUG garden : 153
- (CGW) Community Garden West
- (FEA) Field lab Equipment Area : cv. 'Crimson Queen'
- (HPZ) Horticulture PlaZa : cvs. Dissectum Shojo Shidare, Shojo Nomura
- (TFL) Turf Field Lab