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.
A new kitten. What are we gonna name it? How about tiny ad?
Our PIE page has been updated, anybody wanna test?