American Hazel
Corylus americana
Betulaceae · broadleaf · introduced
Quick Facts
Height
8–15 ft
Growth Rate
Moderate
Light
Sun to Part Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 4a–8b
Bloom Time
March to April
Origin
from Newfoundland to Saskatchewan and south to eastern
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 |
| Leaf drop BBCH 93 | Oct 15-Nov 30 |
| Dormancy BBCH 97 | Nov 15-Feb 28 |
Diseases (19)
Podosphaera aphanis var. aphanis Powdery Mildew
Eastern Filbert Blight
Pseudomonas syringae pv. syringae Bacterial Blight
Armillaria ostoyae Armillaria Root Rot
Blanks
Brown Stain
Cytospora spp. (synonyms: Leucostoma, Valsa) Canker
Catkin Blast
Decline/Collapse Syndrome
Kernel Molds
Various fungi (Phyllosticta spp., Septoria spp., Cercospo... Leaf Spot
Mosaic
Mosses and Lichens
Fumago vagans Sooty Mold
Stunt (Dilly)
Non-pathogenic (abiotic — solar radiation damage) Sunburn
Wet Feet
Taphrina wiesneri Witches' Broom
Limb and Wood Decay