But these environments face threats from invasive non-native species and plant diseases: plants, animals, fungi and microorganisms brought to Wales by everyday human actions.
Rhaid i chi ddiogelu’r coed rydych chi wedi’u plannu rhag difrod a chystadleuaeth gan chwyn, pryfed, plâu ac anifeiliaid pori, fel cwningod, ysgyfarnogod a da byw.