Along streams and in the damp meadows of Europe, marsh marigold unfurls its golden flowers as soon as fine weather arrives. The old herbalists watched it as much as they distrusted it, for beneath its bright finery lies a member of the buttercup family, reputed to be toxic when fresh. Its traditional use remains marginal and always surrounded by great caution.
In some farming traditions of northern Europe, the dried seeds may have been used very sparingly in rustic preparations intended for livestock, never for humans.
Marsh marigold was traditionally gathered and woven into garlands for May celebrations in northern Europe, more for its symbolism of renewal than for any internal use.
Old herbals mention marsh marigold mainly as a toxic plant to know in order to avoid it, rather than as a remedy to prepare, its seeds never having been the subject of a well-established and safe traditional use.
Marsh marigold is toxic when fresh, for humans and animals alike; any ingestion should be avoided. The seeds and fruits do not have a traditional use documented reliably enough for household use. Never confuse it with other yellow-flowered wetland plants; such confusion is a known cause of poisoning. Consulting a health professional or a qualified botanist is essential before handling this plant in any way.
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PFAF, Wikipedia