Okay, so I was really excited about my tomato seeds sprouting and so far that is still going really well. I grabbed a packet of mixed flower seeds I had lying around and put them in some soil I saved from last year and they're sprouting too! I am super excited for that but my question is about the soil. I reserved it from last year when I grew some other flowers and a bigger tomato plant. Is it okay to still use this soil or are some much needed nutrients missing? FYI, everything I'm growing are in pots...I don't have a yard.