….for a square foot garden!!
1/2" PVC tubing and cut it into 18x 10-3/4" lengths 6x 9-1/4" lengths 2x 2-2/1" lengths.
9. cross connectors 
2. 90° Elbows 
1. PVC Reducer Male Adapter 3/4" MNPT x 1/2” Slip. 
2. Male Slip Adapter 1/2" x 1/2" 
2. 1/2" Threaded cap. 
9. Slip on PVC caps. 
for each grid
I like the connected sides on the one below.
Ideas from the Square Foot Gardening Forum
