On Tue, 12 Jun 2018 23:06:35 -0400, wrote:

Assuming you'll be placing clay planters in those wooden boxes potting
soil should be quite adaquate. I would definately not be placing any
kind of planting medium directly into those wooden boxes
or they'd rot within the year.

I certainly do plan to put soil directly in those planters. They are teak,
and I expect them to last more than a year.

Don. www.donwiss.com (e-mail link at home page bottom).