Make cement cloth planters. Approximately a water/cement ratio. Add drainage holes in the planter before it completely hardens to prevent cracking. You may also want to apply a couple coats of cement sealer after the planter is dry.
Cement Cloth Planters Its a one to four ratio. ( 2 cups cement to 8 cups water) however much u want to make. They said to make it the thickness of onion ring batter. Make sure that your cloth is well saturated before you drape it