Zone 5 might be pushing, but it's surprisingly hardy. I have kept mine in the unheated part of my greenhouse. That stays warmer than the outdoors, but - though spared the very worst of NW Arkansas winters - they've still taken some serious subfreezing temperatures in stride, even in pots (in the -6 to -10 C range). But the person from whom I got them (and who I think is on this list, and I hope will speak up) has been growing and breeding with S. tubiflora for some years now, and I know he's overwintered it and some of its hybrids outdoors here. I don't know if he's provided extra drainage for it or not. Though it does get leggy, I like it - nice fragrance, too, which is pretty rare in sinningias. We're nominally zone 6, though our winters for the last ten years have been zone 7. We hit -18 C (0 F) several nights running this last year for, I think, the first time in the twenty-first century. Steve whose Manfredas are also having a great year - flower spikes over two meters and still growing. On Sat, 19 Jun 2010, Adam Fikso wrote: > Doesn't seem to be a candidate for outdoors in 5a, although crinums from Z 9 > are working out here, just under the eaves of my house, just behind and near > the drip line. > ----- Original Message ----- > From: "Richard Kyper" <clayton3120@cablespeed.com> > > > I've grown Sinningia tubiflora for a 5-6 years. It blooms reliably in > > my greenhouse, often reaching a height around 3-4'. Hardy to zone > > 7? Ummm, I would not trust that figure. -- Steve Marak -- samarak@gizmoworks.com