Mountain Maple
Acer spicatum
Sapindaceae, Aceraceae · broadleaf · introduced
Quick Facts
Height
15 ft
Growth Rate
Moderate
Light
Part Shade
Soil
Wet Tolerant
Water
Moderate
Hardiness
Zone Zones 2a–8b
Bloom Time
Mar 15-May 15
Fall Color
Brown, orange, scarlet, yellow
Origin
eastern North America, from Labrador east to Saskatchewan
Phenological Calendar
| Stage | Typical Window |
|---|---|
| Bud break BBCH 07 | Feb 15-Mar 15 |
| Leaf emergence BBCH 11 | Mar 1-Apr 1 |
| Bloom start BBCH 61 | Mar 15-May 15 |
| Bloom end / petal fall BBCH 69 | Apr 15-May 31 |
| Fruit/seed development BBCH 71 | Jun 1-Aug 31 |
| Fruit/seed maturity BBCH 85 | Sep 1-Nov 30 |
| Fall color / leaf senescence BBCH 93 | Oct 1-Nov 15 |
| Dormancy BBCH 97 | Nov 15-Feb 28 |
Diseases (19)
Verticillium dahliae Verticillium Wilt
Rhytisma punctatum Tar Spots
Podosphaera aphanis var. aphanis Powdery Mildew
Phyllosticta spp. Phyllosticta Leaf Spot
Neonectria ditissima Nectria Canker
abiotic (drought, heat stress) or bacterial (Xylella fast... Leaf Scorch
Multiple possible causes (see Disease Cycle section) Fasciation
Pseudomonas syringae Bacterial Leaf Spot and Dieback
Various species including Colletotrichum acutatum, C Anthracnose
Kretzschmaria deusta Brittle Decay
Limb and Wood Decay
Armillaria ostoyae Armillaria Root Rot
Bigleaf Maple Decline (Bigleaf Maple Dieback)
Phytophthora spp. (P Bleeding Canker
Various fungi (Phoma spp., Phomopsis spp., Cytospora spp.... Branch Canker
Taphrina spp. Leaf Blister
Various fungi (Phyllosticta spp., Septoria spp., Cercospo... Leaf Spot
Phytophthora spp. (P Phytophthora Root Rot
Cryptostroma corticale Sooty Bark Disease
Pests (13)
Vasates quadripedes Maple Bladdergall Mite
Pulvinaria innumerabilis Cottony maple scale
Cinara occidentalis, Cinara abietis Aphid
Western boxelder bug
Carpenterworm
Leafcutting bee
Maple tip moth (Maple twig borer)
Lepidosaphes ulmi Oystershell scale
Cylindrocopturus furnissi Root weevil
Rose leafhopper
Satin moth
Western flower thrips
Maple shoot moth