Pot plants correctly. The plant container type and size, and the potting soil you use have a lot to do with correct watering.
Use a lightweight potting medium instead of a garden soil for indoor plants.
Use special potting mixes for plants like orchids and cacti. Research your plants and use the right planting medium.
Make sure all pots have drainage holes.
Use a pot that isn’t too big. When transplanting, the new pot should not be more than 2” (5cm) wider or deeper than the old one.
Re-pot the plant if it is very root bound. The plant becomes root bound when it outgrows its container.
Water plants on their schedule, not yours.
Look at the plant and its medium. When the plant is droopy or wilted, something is wrong.
Many yellowed, browning, or dropped leaves mean there is a problem. Wrinkled or shrunken leaves or stems on cacti and succulents mean there is a problem. All of these symptoms can mean the plant is either too wet or too dry.
Check the looks of the soil and the saucer under the pot. Seeing water is a sign the plant is over-watered.
Stick your finger into the medium about 1” (2.5 cm) deep. This is the critical step in determining water needs. You should be able to feel if the soil is dry, moist or soggy.
If the plant is droopy, wilted, shrunken, browning or dropping leaves but the soil feels soggy, then the plant is too wet and the roots are rotting, depriving the leaves of water. Do not water this plant.
If all of the above symptoms are present but the soil feels dry, then the plant needs water.
If the plant looks fine but the soil feels dry consult your care guide to see if this type of plant needs constantly moist soil and water if it does. If it’s recommended to let it dry between watering, water in 2 days or if you see the plant wilt.
Water until water drains out of the pot at the bottom. Then empty any collected water in the saucer under the plant promptly.