- 1). Push your finger into the soil to find the depth to which the soil has dried. If the soil in the bottom two-thirds of the pot or 2 inches below the soil level is dry, then it's time to water. Some plants, like cacti prefer soil to thoroughly dry between waterings, while those with fine roots near the surface prefer to be constantly moist.
- 2). Use a watering can to water the houseplants. Pour water into the soil for two to three seconds, then push a ruler into the soil to measure how many inches of soil are wet. This is an effective way to measure water in inches. Continue watering until you've applied your desired amount of water.
- 3). Plant houseplants so there is 1 to 2 inches of space between soil level and the lip of the pot. Fill the pot to the brim with water and allow it to sink in to water the plants with 1 to 2 inches of water, and repeat as required.
- 4). Flush the soil once a month to wash out waste and excess salt. Pour water into the soil until it runs out the drainage hole at the bottom of the pot. This guarantees moisture throughout the soil as well. Pour the excess water out.
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