Lunaria (honesty) is a mixture of purple, pink and white flowering plants, whose crowning glory are their beautiful, translucent seed heads. Carefully peel back the dry outer layers to release the seeds and reveal the almost metallic discs. Perfect to save for Christmas decorations.
The plants are biennial - sow in summer for flowers and seed heads the following year - they self seed readily and I’ve had best results by just scattering the seeds on prepared soil
Image credit :Josef F. Stuefer