The first year, I covered them with thick mil plastic. It was a huge pain! Why? Because I have so many to cover. After a year, the weather deteriorated it so bad and it added much more moisture. We don't get much rain like some states and my trees are on a drip irrigation except for a few in front of my garage like these. Without the plastic is much better all around, time, money and all. Just about all of my trees are fed from the bottom.