What a great thread, a bunch of true horticulturalists here.
I've considered many, many times to start growing poinsettias to give to my customers at Christmas as a gift. Next year I'm going to accumulate some pots off installs to do this. The only thing that is also stopping me is a lack of space and supplies, could easily rig up a irrigation system like you guys have off the existing drip at my house.
I'd like to grow my own shrubbery and annuals as well, if I get good at it.