Monstera Stek Water. Dark brown spots on the leaves Dark brown spots are a telltale sign of root rot which is caused by over-watering. Avoid extremes in watering.
On the other hand try not and let the potting mix completely dry out if you can help it. If your Monstera is in direct sunlight the brown and black spots may be due to sun burn. Take a container and fill it with tap water.
Im a water propagator.
Signs Your Monstera Is Over-Watered. If the soil feels dry your plant probably needs a drink. My Monstera is in a particularly chunky potting mix so I tend to give it a pint of water I know this because I always just dump my water glass on it and then go and water my other plants. Black Spots on Monstera due to Sun Burn.