[header] How to maintain a planter [title] Check that your planter is draining freely during each watering. [step] If your planter doesn't drain freely after several waterings, the drainage may be blocked. Look underneath the planter and check the drainage holes. 
If they don't appear to be blocked, you may need to change out the compost mix because it can decay and become soggy and waterlogged over time. [substeps] Also check your planter after rain.