Rootballed plants have an advantage as they come with the soil in the rootball and can only be moved when they are dormant (November - April).  Rootballed plants are grown in the field and dug up with a ball of soil around the roots are wrapped with a biodegradable hessian wrap which will decompose with time. The hessian is held on the rootball with twine or pinned in place with nails. The hessian wrap should be kept on when planting. Do not let the plant dry out.