msbatt, As far as I know and seen most people use semi-hard wood cuttings in the summer to propagate Oleander. I'm not saying they can't be grown with seed just what I have seen. If you don't know the difference with the woody makeup of the plants or terms used read this. Most softwoods are spring cuttings new growth. Most semi-hardwood cuttings are what you have on the plants in the summer time they are firm but not hard and very flexible. Hardwood cuttings are in either late fall or winter and can snap very easily when bent. Hope this helps you,

Oleander will grow roots from cuttings, even in water. This is not the best time of the year as they are not putting out much growth this late. Al

Okay, another question, then---since it has to come indoors for the winter I kinda wanted to trim it back. Should I do so now, or wait until spring? And will trimming it back slow down flower production? I know some things take a good while to flower again after pruning, but others don't. (I learned this the hard way with a tropical hibiscus.)

msbatt, From what I have read in my reference book today I see also that it says the cuttings in the spring may be propagated also. So why not do the trimming in the spring and use the cuttings to propagate some new ones. Sorry for the confusion. You will want to use the side shoots of the main stems also. Hope this helps you.