I am needing to move my grapefruit tree from our lawn. It is not doing very well. Not sure how old it is (came with the house). It only produced one Grapefruit this season. It's about 1 m. tall but has holes in the trunk with sawdust coming out. However, some new shoots are growing. Trunk is about 10 cm. diameter. Our soil is thick clay. How do I move it and and what can I do to help it out?