When it comes to preserving healthy trees, especially during construction or landscaping, the bit you can’t see (i.e. underground) is often the most important. A Root Protection Area, or RPA, is a ...

Towering like a pagoda, with scale-like leaves and roots gripping rocks, this tree stands upright on steep cliffs. Thuja sutchuenensis is an endangered gymnosperm plant unique to China. Originating ...