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.
How To Make Survival Cement - See how easy it is to make your own cement if SHTF. You can repair homes, walkways and even build shelter with this stuff. It is simple to make, the ingredients are easy to come by and it is one of the most durable resources