Mulch can be almost any loose aggregate material that will stay put and not significantly reduce air exchange out of the soil. But what kind is best?

Also, it's a long-term commitment type of plant that's hard to get rid of, so make sure you actually like the idea of alfalfa ...

There are many pros to using pine bark mulch, but also a few cons that you might want to consider. This type of mulch offers ... and provides excellent cover over the ground which can stop weeds ...