Red campion (Silene dioica), also known as red catchfly, is a classic cottage-garden flower, producing a bounty of bright pink blooms on 18- to 24-inch-tall stems in early or mid spring through late spring, over dense mounds of rich green leaves. Some plants produce only male flowers (these tend to bloom a few weeks longer, into early summer); others produce only female flowers (these produce seed if you also have male plants). Red campion tends to act like a biennial or a short-lived perennial. It is reportedly hardy in Zones 5 to 8.
I collected these seeds in mid-June 2020, mostly from green-leaved plants, though there were some yellow-leaved plants (from the strain known as ‘Ray’s Golden Campion’) in the area too, so it is quite possible that you may get some golden-leaved seedlings too. Each packet contains at least 50 seeds.