Herbarium of the Ancients — Detailed Monograph

Dyer's Greenweed

Genista tinctoria

Read before use: the information below describes traditional and informational uses — it does not replace advice from a healthcare professional. In case of doubt, pregnancy, breastfeeding, ongoing treatment, or use in children, seek advice before use.

Enhanced precautions for this plant: Plant contains quinolizidine alkaloids (including cytisine) that may be toxic; never exceed reported traditional uses without professional advice. Formally contraindicated in pregnant or breastfeeding women, as well as in children, due to potential hormonal and toxic effects. Possible interactions with cardiovascular treatments and blood pressure medications; seek medical advice before any internal use. Do not confuse with other brooms or ornamental legumes, as some species are even more toxic.

Decoction — Dried flowering tops

Traditional decoction for external or occasional use

Dried flowers were sometimes gently boiled for a few minutes then filtered, for external use in compresses or very occasional internal use reserved for experienced herbalists. A professional must be consulted before any internal use of this preparation. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Dye (color bath) — Fresh or dried flowers and young stems

Yellow dye bath

Flowers and young shoots are macerated then boiled in water to release their pigments, before immersing pre-mordanted wool or thread. The resulting shade varies from straw yellow to golden yellow depending on concentration and bath duration. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Where to find it

Obtaining the plant

Dyer's Greenweed is found wild on heathlands, embankments, and dry hillsides throughout Europe, as well as from some specialized herbalists or nurseries offering traditional dye plants.

Harvest season

When to harvest

Flowering tops are traditionally harvested in summer, during full bloom, in dry weather.

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