Calendula Self-Seeding: Hybrid Genetics and UK Growing Guide

Calendula (Pot Marigold) self-seeding depends entirely on whether you have species or hybrid plants.

Genetic Reality

• Species (Calendula officinalis): Reliably self-sows, modest flowers
• Hybrids: Seeds often sterile or produce variable offspring
• Polyploids: Usually sterile regardless
• Colchicine-induced mutations: Create desirable traits but genetic instability

Practical Advice

• Let seeds fall—see what volunteers appear
• Expect surprises: revertants, new combinations, or nothing
• UK DEFRA guide: April sowing → June bloom
• Marie Iannotti (About.com): 2 months from seed to flower

Malaysia vs. London

Tropical "fling and grow" doesn't translate. London's cool temps require timing. Sow April for summer bloom. Hybrids may not come true—embrace the lottery or buy fresh seed annually.