as a method of "hugelkultur", by putting them in the soil either under or around whatever you are planting, hollow side up. This would create little "buckets" to hold water, and slowly rot away over time, normally by which time the tree will be more able to retrieve its water from deeper in the subsoil. Cheers.
How do they get the deer to cross at the signs? Or to read this tiny ad?
montana community seeking 20 people who are gardeners or want to be gardeners