You can water it thoroughly by removing the plastic nursery pot from your planter and putting it in a sink or bowl. Then, water deeply and let the calathea sit in the collected water. After a few ...

Calathea plants (Calathea spp ... rule of up-sizing or “up-potting” one size larger; move from a 4-inch pot to a 6-inch pot or from a 6-inch pot to an 8-inch pot, for example.