Actually, how many is too many? Because I just planted 10 more seeds, and that's adding to the 12 I planted earlier this week. I'm now up to 5 varieties of peppers, two kinds of chives, and at least 7 kinds of flowering plants. If they all thrive, there are about 60 plants total in my apartment. Tell me about your houseplants so I don't feel like a crazy plant lady.