Hi there! I planted some Chardonnay pearls and Mediterranean white heather (both have small white flowers) but have some space left for a small airy but neat looking tree. I want something that will not be too tall (less than 5 feet) and has fragrant flowers. I'm in zone 6 and this is a part shade area with filtered afternoon sun and clay soil slightly acidic. Im not sure if lilac grows very tall and too bushy looking? Any suggestions are welcomed!! :)