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Rhododendron groenlandicum Observations
(Labrador tea)
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Introduction to the NPN Native Species Observation Program
This erect evergreen shrub (also known as Ledum groenlandicum) grows up to 1m tall, and often forms colonies. Shade-intolerant and often found on moist to wet soils, Labrador tea is common on open peatland dominated by sphagnum moss and in open-canopy coniferous forests. The leathery, narrow, oblong leaves are about 2-5 cm long, with rusty matted hairs on the underside (new leaves have white hairs underneath). The edges of the leaves roll under to help retain moisture. New twigs are densely covered with brown hairs; old stems become reddish-brown to grey. Five-petalled, white flowers, about 1 cm across, occur in rounded clusters at the branch tips.
Source: Plantwatch Canada
You should record when two well-defined phenological events occur for Labrador tea:
- First bloom (FB) First select several plants for observation, and then record the date when first flowers are open in at least three places on the observed plants.
- Mid bloom (MB) This is the date when 50% of the flowers are open in the observed plants.
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Please record average dates for each event among multiple plants of the same species. Report by email if any plant appears in poor health or event dates for same-species plants vary by more than a few days.
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