Posted: 03/04/2017 at 21:05
How long is it since you bought and planted it? If it's just a couple of weeks I reckon you could de-pot it, soak the root ball till no air bubble appear then tease out the roots and re-plant. Make sure there are crocks in the bottom of the pot to stop the drainage holes being blocked.
Plant it at the same depth it was at before and add a small amount of feed to the compost you use to fill the pot so it is well spread and not concentrated anywhere. Water well and then mulch with some gravel or chipped bark or expanded clay pellets as you prefer. This will stop moisture evaporation on hot or windy days.
If the drainage holes are kept free and you stand it on pot feet or bricks, it will be hard to over water. You can tell when it needs watering by poking in a finger. If the compost feels dry, water.