Reseda luteola. Weld is an ancient plant giving very good light fast bright yellow dye. Leaves, stalks, flower heads with seed all produce colour. Weld seed is tiny. It should be started on top of the soil as it need light to germinate. Start indoors about eight weeks before setting outside in late May after all danger of frost in a sunny location. Weld does not tolerate root damage very easily. Great care is needed when transplanting the little rosette plants. It is best to start at least twice as many plants as desired because many plants are lost during transplanting. Weld is a biennial and the rosettes will overwinter and shoot up a 5 – 7 foot flower spike the following spring. It can self-seed readily in the right conditions.