Monitor the soil moisture level

From BonsaiWIKI

HOW TO TEST FOR WATER IN THE BONSAI SOIL

  1. Push a fingertip into the bonsai soil to check for moisture beneath. The top surface of the soil can be misleading, so test the conditions at a depth of 1/2 to one inch.
  2. Another trick is to press a length of chopstick into the bonsai soil and leave it in place. Check the chopstick daily and it will behave as a moisture sensing "dipstick" that will indicate when to water. If the stick is moist, the plant has water.

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Watering - the Hardest Skill to Master
Watering Tips: The need for water | Monitoring soil moisture | Species & water | How to water | Learning to water
Watering Tools: Watering can | Hose-end sprayer | Drip watering | Dripper | Mister | Pump sprayer
Watering problems: Overwatering | Underwatering | Seasonal concerns | Watering when it rains | Bonsai not using water
Watering terms: Water quality | pH | Pollution | Chlorine | Chloramine | Root rot | Poor drainage | Humidity | RH | Mist