I have a new block planter 20′ in length 22″ high and 26″ wide
How much soil should I place into the planter in inches and the mulch?
Certified GKH Gardening Expert
Hopefully you have provided for drainage. If not, deal with that before you place any soil in the planter.
Put 18" of soil which will allow 4" for 2" of mulch and 2" to allow you to irrigate.