Need more description of your system. The picture doesn't tell the whole story of what is being used on the inside.

If the burlap does get access to the water and become wet also, then it will be losing water to the outside air environment also. the burlap looks dry so it may not be getting the water, which is good then.

What kind of mix are you using? The mix also needs to be able to wick water, too.

This post was edited by gardenper on Sun, Apr 20, 14 at 17:36