Botanical atlas

Marsh Marigold

Caltha palustris

Long before it wore the name marigold, this cheerful buttercup relative was one of the first flowers to light up northern wetlands each spring, and it found its way into old May Day garlands and the rushes strewn across church floors as a welcome sign that winter had loosened its grip. In parts of Europe, the tightly closed flower buds were sometimes pickled in vinegar as a caper substitute, and the boiled young leaves occasionally turned up as a foraged spring green, but only after careful, thorough cooking to tame their acrid sap. Country herbalists in some traditions applied crushed leaves externally as a sharp counter-irritant for stiff joints, a practice that carried real risk of blistering the skin. Today marsh marigold is prized far more for the gold it brings to a wet corner of the garden than for any place in the kitchen or medicine cabinet.

Safety.

All parts of marsh marigold contain protoanemonin, an acrid, blistering compound from the same glycoside family found in buttercups, and the fresh plant is toxic and irritating if chewed or swallowed, causing burning, mouth and throat blistering, and digestive upset, along with skin or eye irritation from contact with its sap. Livestock, pets, and children should never be allowed to graze or nibble on it, and because drying or cooking only partially reduces its acridity, it is not recommended for home teas, tinctures, poultices, or any other ingestion or skin remedy. Wear gloves when dividing, weeding, or handling cut stems. If you are ever unsure whether a plant is safe for you, your family, or your animals, consult a qualified herbalist, physician, or veterinary professional rather than experimenting.