[clkeiper]

if the catalog sells them as seed it is far cheaper to start your own. if it is a patented variety that you can only buy as plugs you have to go with plugs... such as Proven Winners. (and Harris seed is not selling those expensive varieties... if you want expensive go to the burpees catalog/site.) you need to start your seeds in the greenhouse though. don't direct seed these unless you have found somewhere it instructs to direct seed.

those are all great fillers. I see Yarrow at the bottom of the harris page. I forgot about that. but it is a perennial. keep it cut back and don't let it go to seed unless you wan an invasion of it. and give 1/2 of it a hair cut to delay flowering for a portion of it.