Yes this planter is safe for growing edibles and non edibles and will not give off any toxic materials.
The Pennington Planter Box Heartwood 40 in. x 12 in. x 12 in. comes already assembled.
The Pennington Planter Box Heartwood 40 in. x 12 in. x 12 in. can be used alone or with a liner. The manufacturer does suggest using a liner so your plants can be transplanted easily if need be.
The Pennington Planter Box Heartwood 40 in. x 12 in. x 12 in. has a closed bottom.
We apologize, but we are not sure where to find a liner for the Pennington Planter Box Heartwood. We would suggest contacting Pennington directly at 844-764-5911.