Recently Diane mentioned Alstroemeria aurea (formerly known as A. aurantiaca) as an invasive geophyte. The "Ligtu Hybrids" are also noted for invasiveness. I wouldn't let this stop me from planting alstros, though, because I love them very much. I think you just have to designate a place where they can romp away. In nature A. aurea can be seen carpeting light woodland (mostly Nothofagus or Southern Beech) and also on open hillsides. I have forms from the latter habitat and they're not obnoxious here; they're also shorter-growing. The Archibalds sell seed of this population from Termas de Chillan, Chile. Populations from farther south seem to be taller, more shade-tolerant, and less brilliantly colored. In my rock garden is a very large berm of sand and gravel over a mound of soil, given over to two subspecies of A. ligtu: ssp. incarnata and ssp. simsii. They're just making their major growth now, but sharing the berm with them are some Juno irises and quite a number of "extra" bulbs that flower earlier, and some species tulips. By the time the alstros elongate, the early bulbs are withering and aren't harmed. Flowering about the same time as the alstros is Hastingsia alba, a big plant from northern California that coexists well. The alstros don't escape because the berm is surrounded by a packed gravel path that is sprayed with Round-up a couple of times a year. If you have room for a feature like this, it is rewarding and provides masses of cut flowers in midsummer. There are also plenty of small Alstroemeria species, some of which should be hardy outdoors in temperate regions. I expect A. revoluta would be, and perhaps A. diluta. A. hookeri did not survive in the open for me (it's coastal). I'll eventually experiment with quite a few on raised scree beds. Jane McGary Northwestern Oregon, USA