Tree-hugger, are you? Groovy. But even if you're not, you can still profess your love of all things arboreal by planting an interactive tree in a virtual backyard at SearsBackyard.com, a website created by Young & Rubicam and The Barbarian Group. Using a water hose and a toolbox full of gardening tools, visitors who take good care of their green charges can watch them grow from humble seeds to fully bloomed trees, earning Sears coupons along the way. By downloading a special widget, visitors can even plant their trees directly onto their computers and track their growth from their desktop. Those who neglect their responsibilities, on the other hand, will only succeed in killing their trees, along with any chance of a second career as a gardener.