I've been real quiet lately, and debated whether I should chime in on this topic, alas I think my poorer part won, so here is a lengthy reply... Christiaan South Africa Thanks Christiaan, I really appreciate the information and I am very pleased that you took the time to enlighten me. Please send some bulbs to the exchange. If they are invasive but tender (killed by freezing) be certain to mention that so they are not bought by the members in warmer areas. (We expect to get near -20 C here this week). I can't imagine a greenhouse invasive that doesn't form seed. My invasive oxalis self-pollinates and shoots seed a half meter or so and is cold hardy, making it a real pest. Tim