Seeds that can be started in spring/summer?
It's now May, and I'm afraid my addiction to growing seeds (especially now that I've found methods that work and I don't have seedlings dying everywhere) has not slowed, I'm wondering if there's seeds to try out that can be started now. I'd probably grow them in my small greenhouse or under lights instead of directly planting; my family's doing a lot of landscaping and catching up on weeding (now that I'm back from college that's been one of my duties) so we wouldn't know where to plant until later.
I was pondering annuals like Zinnias, but I'm afraid to start them only to have them start flowering when it's too late to really appreciate them. I have too many vines planted, so that's out as well. Maybe a perennial? I'm still learning about all this, but it's been a fun process.