I did a new raised bed the year before last because all of mine rotted over the winter, well except the eastern purple. Bob has the best looking coneflowers around. I read an article by Tera Nova that said the same thing as Bob and I think most people get impatient and want them to bloom too fast. I purchased small plants mostly, but I am in a warmer climate so mine grew roots faster. (thanks for the reminder for the bonemeal)
I have ten clumps this year, and the noid I got from coneflower.net turned out to be 'Pink Poodle', I already had one I purchased from Burpee, they are both starting to bloom now and I am very happy with them. Also the Tennessee Coneflower I grew from seed. You will be happier if you can stick with the seed varieties. I have great success with the PowWows.