Perennial
Marigold flowers are yellow, 1–2" diameter, with multiple petal-like sepals and many yellow stamens; they appear in early spring to late summer and are visited by a great variety of insects for pollen and for the nectar secreted from small depressions, one on each side of each carpel.
Sun Exposure: Partial shade–Shade
Soil Moisture: Moist
Soil: Clay, loam
Height: 1'–2'
Bloom time: April–June
Bloom Color: yellow
Habitat: Wetlands, swamps, along streams, wet woods
Attracts: Butterflies, Bees, Birds
Pollinator Benefit: great for pollen collectors like native bees
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Marsh Marigold (Calthus palutris) The Marsh Marigold plant is a herbaceous, perennial member of the buttercup family, native to marshes, ditches and wet-woodland temperate regions of the Northern Hemisphere and is one of the first pond plants to bloom in the spring. This 6-12" Marsh Marigold plant does well in full or partial sun but will wilt in the heat of summer, returning in the fall as temperatures cool.Marigold flowers are yellow, 1–2" diameter, with multiple petal-like sepals and many yellow stamens; they appear in early spring to late summer and are visited by a great variety of insects for pollen and for the nectar secreted from small depressions, one on each side of each carpel.
Info from www.prairiemoon.com