Could anyone name this plant?
Idiotically I forgot its name right after buying it last week. I'm pretty sure it started with a C.
Many thanks in advance.
You're right, it does begin with a C - its Coreopsis grandiflora, common name Tickseed, a relatively short-lived, very floriferous perennial. Needs a sunny spot, give it some room, it tends to sprawl in its second year if it makes it through the winter (it sometimes doesn't make it through in colder regions).