Speckled Alder
Alnus incana subsp. rugosa
Betulaceae · broadleaf · introduced
Quick Facts
Height
20 ft
Growth Rate
Fast
Light
Sun to Part Shade
Soil
Wet Tolerant
Water
High
Hardiness
Zone Zones 2a–8b
Bloom Time
March
Origin
is eastern North America, it is most common in the Great
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 1-Mar 31 |
| Bloom end / petal fall BBCH 69 | Apr 1-Apr 15 |
| Fruit/seed development BBCH 71 | Jun 1-Aug 31 |
| Fruit/seed maturity BBCH 85 | Sep 1-Nov 30 |
| Leaf drop BBCH 93 | Oct 15-Nov 30 |
| Dormancy BBCH 97 | Nov 15-Feb 28 |
Diseases (11)
Armillaria ostoyae Armillaria Root Rot
Brown Leaf Blotch
Canker and Stem Diseases
Catkin Hypertrophy and Leaf Curl
Phytophthora cactorum Collar Rot
Drippy Dieback
Various fungi (Phyllosticta spp., Septoria spp., Cercospo... Leaf Spot
Neonectria ditissima Nectria Canker
Phytophthora spp. (P Phytophthora Root Rot
Podosphaera aphanis var. aphanis Powdery Mildew
Thekopsora minima and Naohidemyces vaccinii Rust