One of the doubts most asked by all gardeners and planters is that of how to fatten a tree trunkthat is, what can be done so that the plant develops a wide, well-formed trunk, and does not get left with that thin and weak stick that it has at the moment.
As well. There are several things that can be done, but first it is important that we know something: We must have patience. These plants can take a long time to get fat, although we can help them by taking care of them in the following way.
If you want to know what you can do to make the trunk thicken, below we offer you several tips and tricks that will be very useful to achieve that end:
Use sandy substrates
Sandy substrates, such as akadama, the pomx (for sale here!), or similar are the most recommended to get the trunk of the tree to widen, since keep the roots properly aerated so that the plant can grow without problems not having to worry about anything.
The fertilizer is very important, especially for plants that are in pots, and more if you use sandy substrates that contain almost no nutrients. Thus, throughout the growing season, that is, during spring and summer the trees must be fertilized.
With what? Well, you can use chemicals (like universal) or natural (such as guano), but so that they do not lack anything I advise you to use one once and the following month another. Remember to follow the instructions specified on the package if you use chemical and / or liquid fertilizers.
Plant your tree in the ground
To make the trunk fatter as soon as possible, the best thing to do is plant it in the ground in an area where it receives a lot of direct sunlight and take care of it like another garden plant for at least two or three years. After that time, the trunk will have already fattened enough to be able to be worked as bonsai.
Plant it in a large pot -30cm in diameter- before placing it in the garden. This will make it much easier for you to get it off the ground when the time has come.
Use large pots
If you don’t have a garden, you can use a big deep pot so that the trunk of your tree fattens. The diameter will vary according to the size of the plant, but it is generally recommended to use containers 20cm or more in diameter.
Remember to fill it with sandy substrates, since if the trunk is planted in peat it will take longer to get fat.
Prune from time to time
This is especially if you want to work your tree as bonsai. If you want it to thicken, in addition to what we have already told you, another thing you have to do is prune it. These prunings must not be drastic at all, but the point is to leave the trunk without branches up to a certain height, and to reduce the length of the rest of the branches.
For example, let’s imagine you have a small tree whose trunk is 1 meter high and begins to branch 60 centimeters from the ground. What is there to do? Well, in this specific case what we advise is to reduce its height to about 80 centimeters; in this way it will take out lower branches, and in the process the trunk will get fatter.
If we want it for bonsai, in the coming years we will reduce its height more, about 10-20 centimeters / year, and only if the tree is responding well, producing lower and lower branches (which is what it should do).
In addition to the height of the tree, you have to take care of the length of the branches. Note that when pinching them, that is, when removing the newer leaves, the plant will tend to take out secondary branches. This is very good, since the crown will be more populated with leaves.
Anyway too it is very, very important to know that there are species that it is better not to pruneeither because they do not tolerate pruning, or because they are simply plants that look much prettier when grown freely. Some of them are: hackberry (Southern Celts), Brachychiton (all), willow (Salix), or the flamboyan (Delonix direction).
We hope these tips are useful to you.