Gomphrena is the basis for a small running joke at work: Younger Co-Worker commented a few months ago that the name sounded sort of like a disease, and so whenever I'm feeling kind of run-down I try to mention to her that I'm having another flare-up of the ol' gomphrena again. There's a second joke behind the first joke, which is that I think the real-life disease she was referencing was most likely gonorrhea, which does add a little something to the humor even if I can't quite put my finger on it. (There's even a third joke to be made off of the previous two. Something about purple gnome gonorrhea: I can feel that there's a joke there but I can't figure out how to make the joke work properly.)
Anyway. I don't find this a terribly objectionable plant. It's behaved well in the greenhouse, and we even sold most of it, so it's okay. It still strikes me as being a weird thing to try to sell to people. The flowers aren't especially showy, and there are other things out there that will get you the same color. So I shrug.
Alyssum is also just okay, as far as I'm concerned. The flowers smell nice, but the plants don't seem to stay looking very good for very long. We have a real problem with not being able to ignore the plants that want to be left alone; after enough overwatering, Lobularia start looking kinda weedy. Or not even weedy. Weeds, after all, often look quite vigorous and healthy. Our Lobularias start to look like weeds that have migraines. I do understand wanting to buy them when they look good, and so far at any given moment we've had some looking nice, for anybody who wanted them, but even when they look nice they're not especially showy, and it's not like it's hard to find substitutes with small white flowers (Bacopa or Euphorbia 'Diamond Frost,' e.g.). They're also so tiny -- which could be our fault, not the plant's -- that it's hard to imagine any practical gardening use for them. Which is probably a failure of imagination on my part.
Ageratum, though, wins the prize for winning the fewest prizes. Unless it does something really cool later on in the summer, I cannot imagine why anybody would want one of these. I mean, hell, I actually forget that they're there, a lot: the leaves are nothing special, the flowers are simultaneously small, somewhat unflowery-looking, and a washed-out color to boot. Also, we have at least three varieties ('Azure Pearl,' 'Hawaii Blue' or 'Blue Hawaii,' and a third one that I can't think of right now), but the flowers are, as far as I can tell, all the same kinda washed-out, very slightly purplish baby blue. Looking Ageratum up on-line didn't help answer any of my questions, either.
So I submit the question to you, the reader: what, if anything, do these three do? What makes them something that people would want to buy? Do you like them yourself? Etc.