Each Planter Well will irrigate 9" of soil beyond its edge, so one
12" Planter Well reservoir will keep the soil moist in a window box or
planter that is 30" long.
Rules Of Thumb for the 12"L x 8"W x 3"H Planter Well
Reservoir
Using One (1) Planter Well
12"-30" Interior Length x 8"-14" Interior Width x
8"-14" Interior Height.
Using Two (2) Planter Wells
27"-51" Interior Length x 8"-14" Interior Width x
8"-14" Interior Height.
Using Three (3) Planter Wells
42"-72" Interior Length x 8"-14" Interior Width x
8"-14" Interior Height.