Reseda luteola Hardy biennial for Yellow dye;

An attractive tall spike plant good for prairie type planting, or for the back of the herbaceous border, even if you don't want to use it for its dye value.It is a biennial, meaning the part you need for dying is only produced in the second year after seed sown, after which the plant dies.

Seed available in autumn
Part to use for dyeing;leaves, flowers and stems when in full flower, but before flowers start to fall. Also dried flowers and stems can be used.

Mordant; alum