Learning how to water indoor bonsai trees is not a simple process that can be done with a set of mathematical rules. Determining the best watering schedule takes trial and error, but luckily there are some very basic tips that will make this determination much easier. 

By following the steps laid out below, you can learn how to water your trees more successfully while also reducing the risk of overwatering.


1) Don’t Stick to a Strict Schedule

The first tip for watering bonsai trees indoors is to never stick to a strict watering schedule. While the majority of bonsai gardeners do stick to a schedule, you don’t want your indoor bonsai to be one of them.

Instead of watering your bonsai on a schedule, you want to try and gauge when it needs to be watered in order to reduce the risk of overwatering.

The best way to determine when your tree needs to be watered is by observing its soil. The following steps will help you learn how to water your bonsai in the most efficient way each time.


2) Find the Right Balance Between Water and Soil

The best way to start is to get the perfect balance between water and soil, which is usually found through trial and error. First, gather your materials which include a bonsai, a watering can, a small tray and a water metre.

Water the bonsai until the soil appears to be damp enough. When the soil doesn’t look dry anymore, take the soil’s moisture level by using the water metre. Make sure to do this when the soil is still moist.

If your soil’s dryness matches that of the soil when it was damp, then you’ve found your perfect watering balance. If it’s drier than the damp soil, then you’ve likely overwatered your tree, so be sure to dump out all of the water in your tray and allow the tree to dry out a bit before watering again.


3) Don’t Let Your Bonsai Trees Dry

Bonsai plants are best watered at the roots.

The last thing you want to do is to allow your bonsai tree to dry out. If you do, the tree’s leaves will close up and you can cause stress to the plant’s roots.

Try to water your tree as soon as you notice it drying out. You can even set up a watering schedule so that you don’t forget to water your tree daily.


4) Don’t Let Your Bonsai Tree Sit in a Tray Overnight

When watering your bonsai trees indoors, be sure to drain all excess water from the tray before placing it back on the stand.

One of the biggest mistakes that bonsai gardeners make when watering their trees is leaving the water in the tray overnight. This type of practice will cause your bonsai tree to rot.

When the water evaporates from the soil, it will leave behind minerals, chemicals and salt on the surface of your soil. As a result, your tree’s roots can become damaged and die.



By learning how to water indoor bonsai trees, you can enhance your bonsai growing experience while also taking proper care of your trees.

Find all the necessary resources you need to grow your bonsai trees at Bonsai Shop. We have everything, from bonsai accessories to bonsai trees. Visit our shop page for more details.