lilacs such as President Lincoln.? I live in Denver CO and want a pretty and fragrant privacy screen. I'm only living in the house for 5 years so I want "instant garden" that I'll be able to enjoy most of my time living here instead of spending a lot of money on a garden that only the next home owners will enjoy. I'm considering buying 5 gallon potted President Lincoln or President Grevy lilacs because I read they were fast growing but, how fast? Before I fork over the money next spring, I want to make sure they're right for me. Thank you lilac lovers!