I love the look of the weeping cherry trees, and was wondering a few things..The ones in the nursery I looked at said that they get up to 30' high...but everywhere I see them they are in small plantings, like ornamental, near a house..are there different kinds? I also searched this site for info first, and one poster said that the weeping cherry tree is only expected to last a few years in a northern climate...one weeping cherry tree I saw said "northern hardy". Are there different ones for different climates?