I grow Coreopsis verticillata, the yellow variety.
Do you grow it, Eric?
I dont know about your garden, but in mine, it's only beginning to awaken from its slumbers now - July
I have to remember where it is at all times and keep that patch weed free waiting for it to "happen".
However, when it does, it's a very pretty flower.
Its supposed to spread, but mine hasnt read the cue.
I'd be keen to give 'Sweet Dreams' a try at that offer price, but need to find a nice location for it.