For 2 seasons my potted plumeria seemed to do just fine. But after these past weeks of nothing but rain, I noticed 2 are not draining properly. I re-drilled the holes in the bottoms of the pots. But the soil seemed heavy and wet. ONe is still not draining at all! What is the proper way to repot them? Do I get rid of ALL the soil and only replace what I can remove around then? Or bare-root them giving them all the new clean soil to start over. One tree is 4 feet tall. The other is about 6 feet tall.