Labrador-tea

Ledum groenlandicum

Ericaceae · broadleaf evergreen shrub · introduced

Last updated March 9, 2026

Data Coverage 2 of 6 dimensions

Site Data

Threats

Cultivars

Phenology

GDD Thresholds

Puget Sound

Quick Facts

Height

3 ft

Spread

5 ft

Growth Rate

Slow

Light

Sun to Part Shade

Soil

Wet Tolerant

Water

Moderate

Hardiness

Zone Zones 4a–9b

Bloom Time

May 1-May 31

Origin

North America

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	May 1-May 31	First open flowers visible; flowers white
Bloom end / petal fall BBCH 69	May 15-Jun 15	Last petals falling; flower structures fading
Fruit/seed development BBCH 71	Mar 15-May 31	Fruit or seed structures forming
Fruit/seed maturity BBCH 85	Jun 1-Aug 31	Fruit fully colored and ripened; seed dispersal may begin
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