If you must use an opaque pot lacking drainage… do it right. It's hard to improve later.
Rig a water reservoir in the bottom and install a watering tube.
((If you don't want to bother, a good minimum is to stick a pipe through the dirt, so you can pull it out and make a proper watering pipe at some point in the future.))
It's easier than you think. Ingredients:
- a wine cork
- a plastic pipe
- some steel wire
- expanded clay balls (or round balls of any kind)
- some old nylon or polyester clothing you can cut up
Put the pipe in the pot, making it stand perfectly vertical.
Cut the cork down to something that will fit inside the tube.
Stick a steel wire into the cork. Drop the cork into the tube so it hits the floor. Don't cut the wire just yet.
Fill the pot up with a few centimeters of clay balls. Then add water until it matches the same level.
At this point the cork will be floating in water. Now cut the steel wire at the exact point it exits the tube. That's your marker! That's how you see that the reservoir is full.
Put down some nylon or polyester like a mat over the reservoir, blocking roots from growing down into it. If you can, seal tightly around the tube and also line the walls, but don't be a perfectionist… it's just a plant.
I prefer pots with drain holes or glass pots, it sidesteps all this work.