Plant lovers can turn into "mass killers" for watering plants. Watering too much or too little is a mistake. Many people who are new to gardening or growing plants in pots often make the mistake of watering more than necessary because they think that the more water the plants provide, the better. The same may be true for some species of plants, but others may die when over-watered.[4]
Besides figuring out your plant's water needs, there's a trick to helping you know when and how much to water: poke your finger into the soil about 2-3cm deep. Usually you should water your plants when the soil is a bit dry. Water just enough so that the water comes out a little through the drainage hole in the bottom of the pot. Avoid over-watering as the plant will become waterlogged.
Make sure the pot has good drainage, otherwise the roots may experience a condition called “root waterlogged”. This condition can have a negative impact on the crop.
Succulents and plants adapted to arid climates typically require less water than plants that live in wet areas. You need to let the soil dry completely between waterings.
Seedlings usually have higher water requirements than mature plants. You need to keep the seedlings moist continuously until they grow a few tens of centimeters above the ground.
Fastidious plants like orchids often require higher water quality, as they are sensitive to chemicals found in tap water. In this case, you need to use distilled or spring water instead of tap water.