I did Stuttgarter last year. They were good and many were large enough to satisfy me. I believe I planted in May though, but that's because I was waiting on Gurneys to ship. I would certainly grow them again and found that they are sold locally as sets in the local chain of ag supply stores.I have always planted onion sets, and they have done at least ok, and sometimes really well. The two types I like are Stuttgarter (yellow) and Red Baron (red), and both are pretty pungent.