Hazel Alder, Smooth Alder, Tag Alder, Swamp Alder

Alnusserrulata

Family
Betulaceae (beh-tyoo-LAY-see-ee)
Genus
Alnus (AL-nus)
Species
serrulata (ser-yoo-LAY-tuh)
Synonym
Alnus incana var. serrulata
Alnus noveboracensis
Alnus serrulata var. subelliptica
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Deciduous
Height
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
12-15 ft. (3.6-4.7 m)
15-20 ft. (4.7-6 m)
Spacing
12-15 ft. (3.6-4.7 m)
Hardiness
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
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)
Danger
N/A
Bloom Color
Inconspicuous/none
Bloom Time
N/A
Other Details
Category
Shrubs
Trees
Water Requirements
Requires consistently moist soil; do not let dry out between waterings
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

This plant is said to grow outdoors in the following regions:

Atmore, Alabama

Morrilton, Arkansas

Winterthur, Delaware

Lawrenceville, Georgia

Monroe, Georgia

Bangor, Maine

Chatsworth, New Jersey

Youngstown, Ohio

Downingtown, Pennsylvania

show all

Featured Videos

Gardener's Notes:

1
positive
1
neutral
0
negative
Sort By:
Sort By:
R
Downingtown, PA | December 2013 | positive

I've seen it wild in a few spots along watercourses or ponds in southeast PA and northern Delaware. Seems like a nice native plant that w...Read More

E
Atmore, AL (Zone 8b) | August 2007 | neutral

Hazel Alder grows in wet areas along streams in my area. It commonly grows along with Sweetspire, Buttonbush, and Elderberry.

Featured
Black chafer
(Netocia morio)
House Martin
(Delichon urbicum)
Featured
Black chafer
(Netocia morio)
House Martin
(Delichon urbicum)