In zone 5 it will act much like a butterfly bush. It will usually die to the ground or snow line and put out rampant growth come spring. Once established it can grow 6ft or greater in a few months, and bloom in July until frost. It may not always die back to the ground. I've seen a few in Ohio that are more "shrub/small tree like," easily 10ft or greater, but the larger ones are usually planted in protected areas or in cities, where the benefit from extra heat. I've alwasy been told that good drainage is essential in overwintering them in marginal zones, but I don't know??? Mine is in clay and it does well.

Olga, As you know Chaste Trees are herbs. I have two in my landscape, now each about 9' tall. I don't know if they would make it in zone 5. I see them typically in Zone 6 or warmer. I've attached a link to pictures of my chaste trees, btw. I have tried to grow them from cuttings and did get a few started, but they died early (not sure why). I was at a nursery in Joplin, MO last week(try www.botanyshop.com) and they had 3 or 4 chaste trees for sale for $18 each. The trees were about 30" tall. They do have an email address and are very helpful. So perhaps they can answer your zone 5 question. Also, if you go to GardenWeb's Herbs Forum, there have been a few discussions on chaste trees. (just search the forum) Mel Here is a link that might be useful: my chaste trees

Yes - vitex is a bit different in that several well known Texas horticulturalists recommend pruning it to an extent that would seem barbarous on almost any other tree. The most extreme calls for cutting it to the ground each year (to maximize blooming), though have seen Greg Grant designs where trunk(s)/branches were pruned back to about a 6ft height to maintain it as a small tree. Seems you should have a lot of flexibility to fit into the required space and possibly improve its flowering. Neil Sperry's aggressive Vitex pruning example includes a link to Parsons' more extreme recommendation.

Changing up what plants I want for my yard. I have these two in Orlando, FL. Looking for a Tibouchina Tree (Granulosa NOT the dwarf version) and Golden Shower Tree (Cassia Fistula).