In 2015 I bought from a local nursery a ficus plant with three trunks grown in the same pot. At the moment, the idea was to interweave the trunks and fuse them together to form one tall plant as room decoration. On the way of fusing, something went wrong as the trunks did grow unevenly. Hence, it was impossible to continue the same project because there were no more trunks to fuse. In the picture below you can see the interweave trunks. However, this plant grew vigorously for the past 2 – 3 years and I have decided that the only remaining possibility is to airlayer the tree exactly at the highest fusing point of the former trunks.
On YouTube or on Google there are several methods for air layering, mainly all being based on using sphagnum moss as wet coating. Many methods are based on cutting the bark around the three for a height of few centimeters. Many such procedures failed because the tree rooted only on one side or not rooted at all. I think that if you create a “custom made” root system, it is highly important to start the right way. Cleaning a section of the bark around the tree can result in uneven roots. One method to control the roots for a certain position of growth is to clean off the bark of the tree only in the points where you are interested in promoting new roots. In the same time, using such a technique one can obtain a nice nebari evenly distributed around the tree.
As it follows I will present step by step how I did the airlayering of this ficus tree. First thing to be done is to moist sphagnum moss in tap water (or rain water if available) for at least half an hour before starting to airlayer. If you moist too much moss, it is not a problem. You can use the rest of the moss to distribute it evenly on soil’s surface. This will eventually give new living moss if proper care is considered by misting it several times a day.
For airlayering I have considered to use the point of the trunk where the last fusing happened. It is strange how after fusing, practically only one trunk grew continuously and the other two faced lack of energy and had a very slow development compared to the other one.
Using a drill, of course not fixed in a drilling machine but driven by hand, I performed few holes in the bark, around the tree. The depth of the holes is dictated by the thickness of the bark. However care should be considered to not penetrate the tree too deep to damage it. Doing so, you will be able to control the new roots to grow only from the holes performed with the drill. creating the holes around the tree at the same height will ensure that the nebari will have the same plane of development.
I have drilled one hole directly in the point where two trunks fused. This hole had to be deep enough to penetrate the bark that is quite thick. This hole was drilled deeper than the other ones from the surface of the trunk. You can compare yourself the holes from the picture below.
The holes performed by hand were all powdered with rooting hormone for woody plants. This was bought from a local nursery. I personally use for powdering with rooting hormone a brush used by makeup artists. This helps in a correct and even settling of the powder in the holes. To increase the speed of the the rooting process zip ties are used to strangle the trunks. This will slow down the energy coming from the leaves to reach the roots in the pot and will force new roots to emerge from the holes drilled in the trunk. Mainly this is the motivation of using these zip ties.
The last step is to fasten a transparent plastic bag around the holes and fill it up with the sphagnum moss moistened earlier. I closed up the bag as strong as possible to stop the humidity from inside the bag to evaporate. From time to time I put some water on the upper part of the plastic bag and it slowly finds it way inside keeping the moss moist all the time.
As soon as the new roots will develop, the transparent plastic bag will help to see the actual new growth. More, this helps to decide when the new roots are sufficient to perform the separation of the new rooted tree from the old trunk and pot it into new soil. I will keep this topic updated when this moment will come.