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Trillium grandiflorum Observations
(trillium)
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Introduction to the NPN Native Species Observation Program
This woodland plant (10–40 cm tall, also known as white trillium) is found in rich, moist, well-drained woods and wet areas at low to mid-elevations. They prefer semi-shade, and are often found under sugar maple and beech trees in open forests. Characteristics of the plant include three oval leaves, which taper gradually to a point, and three distinctive white petals that form a single white flower up to 10 cm across. Flowers fade over time to a dull pinkish purple shade, and become slightly transparent. The greenish, round fruit forms a six-sided, berry-like capsule.
Source: Plantwatch Canada
You should record when two well-defined phenological events occur for trillium:
- First bloom (FB) First select an approximately 1 by 1 meter plot for observation, and then record the date when first flowers are open in at least three places on the observed plants.
- Mid bloom (MB) Within the same 1 by 1 meter plot used for first bloom, this is the date when 50% of the flowers are open on the observed plants.
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Report by email if any plant appears in poor health.
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