Alder (Frangula alnus) — Plant Profile

Quick Facts

Height

15 ft

Spread

13 ft

Growth Rate

Fast

Light

Full Sun

Soil

Adaptable

Water

Moderate

Hardiness

Zone Zones 3a–8b

Bloom Time

Apr 1-Apr 30

Fall Color

Yellow

Origin

Europe, western Asia and North Africa

Stage	Typical Window	What to Look For
Bud break BBCH 07	Feb 15-Mar 15	Buds swelling and beginning to open; first green tissue visible
Leaf emergence BBCH 11	Mar 1-Apr 1	First leaves fully unfurled on new growth
Bloom start BBCH 61	Apr 1-Apr 30	First open flowers visible; flowers yellow
Bloom end / petal fall BBCH 69	Apr 15-May 15	Last petals falling; flower structures fading
Fruit/seed development BBCH 71	Jun 1-Aug 31	Fruit or seed structures forming; fruit color: red
Leaf drop BBCH 93	Oct 15-Nov 30	Leaves yellowing and dropping; no significant fall color display
Dormancy BBCH 97	Nov 15-Feb 28	Leafless; no active growth; dormant buds set

Asplenifolia

Common name: Asplenifolia Alder Buckthorn; Mature height: 10 ft

Fine Line

Common name: Fine Line Alder Buckthorn; Mature height: 5–7 ft