Hi Linnea:
I do come north sometimes in the summer, to visit CBG, or if I do't get white calamint at the swap, I will probably drive up to Lurvey's to get it (I saw it there last year and was too cheap to buy it). Whereabouts do you live?
I feel like if you bring a few of the gallon containers they may even be used during the swap; often someone brings a big clump that we break up. I plan to bring a few 4" pots in case they're useful for that too. Or someone will want them for next year.
Cherry tomatoes can be grown in containers, but they do get as big as regular tomato plants (the one heirloom dwarf cherry I grew tasted nasty, but probably some hybrid ones taste nice. I can't save their seed and get the same plant the next year so I haven't tried them). They are thirsty plants so plan to water them every day. My mom grows her tomatoes and veggies in Earth Boxes now, which are not cheap but are very nicely made. She puts two plants in one earth box.
Snow in Summer is a different plant but you should have your friend try it too. It's very tough and looks nice all the time, except it spreads by flopping forward then rooting, and if you fold it bck so it doesn't spread it looks messy for awhile. I'm not sure how much shade it can handle but it's doing well in semi-shady parts of my yard. I'm bringing a small pot too, let me know if I should set it aside for you.
http://www.missouribotanicalga...
I can't remember if I told you I came across a small variegated bishop's weed for you. (I grabbed some soil posted on craig's list and in it came some shasta daisy and a chunk of that!) It's looking very perky and is ready to spread in your friend's yard.
Another plant he might like for shade is galium odoratum, sweet woodruff, which many complain is invasive so I don't bring it to the swap. It was a true perennial for me; sleeping, creeping and now leaping in dry shade. I will dig up a little tomorrow in case you want it.
Remind your friend that trouble-free plants still need some babying until they are established
He may find it easier to use some water crystals while planting, rather than get out and water more often. (I just received an order that included xeric plants, and the amount of water crystals they recommend for the xeric plants is actually more than I usually use on regular plants of that size!)
Thanks for the mention of the dirt you get from Menard's. I like shopping there in general but had not tried those products.