Great info. Jo Ann & thanks! I did not know about them putting plugs in larger pots so I will be on the lookout for that. It happens though that the 3 times I've lost coneflowers (or anything else planted when summer is bearing down in us) were well rooted. We get so hot so early here. May was in the 90's plenty of days & here, when we say 90's, that's not just getting *up* to 90 but rather hitting 90's @ 11am or before (in spring!) & staying that way allllllllllll day long until the sun goes down. This will be true pretty much through September only we get mid to high 90's. Full sun here is a brutal 12 hours & very strong. Further complicating matters is we have sand for the most part & sand holds nothing for long. Water? It sure doesn't last long - drains right out. So plants here, even if well rooted in the pot, need time in a gentler season to get acclimated & dig in really well.
I may just have to start getting things in spring & then potting them up & babying them through summer & finally plant in the ground in fall. Sort of the long way around the barn, but whatcha gonna do?