Spring Watering Tip-
There are a lot of things we might say about watering bonsai. I’ve tried a few times on this blog to mention some of them. Some are hard to make sense of in words, but as ever I’m willing to try. This one is about watering recently repotted trees.
At post-repotting time we need to be awake to one change-up, and that is that the interior soil mass (the part that was returned to the pot) may dry out much faster than you’d think.
- If that interior area is full of fine roots, it will dry out fast after repotting.
If you cut all the fine roots off in repotting your tree, shame on you, but that’s a different issue. For the sake of this example, we’ll assume you have fine roots, and that we’re talking only about established trees with a solid mass of roots and soil. There are myriad other situations, such as proto-root balls with stringy roots that don’t yet hold soil together, but these photos show what we’re hoping for and working towards.
Especially with conifers, we usually don’t prune any branches at the same time as repotting. And so…
- In repotting refined bonsai, we’ve created a situation where fewer roots are going to be supplying the same upper water need.
This interior mass we’re talking about, this is the area you should watch to determine when to water. Ignore, for a few weeks at least, taking your moisture reading from the new soil you’ve settled in around the original mass. There’s no active roots in the new soil yet and it won’t be drying out fast.
- Another thing to keep in mind when repotting is to keep a portion of this old soil mass exposed, not covered with new soil, so that you can see when it’s drying out.
In many cases you’ll be watering when the new soil is still moist. So we ignore that area. Again, I’m only commenting on watering repotting bonsai with more mature root structures.
- To sum up, only read the moisture level where there are roots to determine when to water.
Wordy post. Hope some of that made sense!
Here’s a previous post about watering that might spread a broader net around the issue of watering: