I have so many Gulmohar around. How can I use Gulmohar fruit/flower to start my own Gulmohar bonsai.
If you have so many Gulmohar around, I wouldn't start with seeds or cuttings, but I would dig out a small tree (sapling of ~2-3 year old). Depending on how big you would like to make your bonsai, you can take a sapling that has a firm stem already, let's say a stem of 2-3 cm (1 inch) in diameter.
Then, start trimming the plant into your favorite form and also trim the roots, before putting it in a bonsai pot.
There are instructions on internet of how to do this with other species, for example here.
Starting from a cutting might be a better option. If you start from a cutting you have a season or two head start. This is a lot when growing a bonsai as it will look mature faster.
The quick version
Cuttings can be taken from the previous seasons growth. This means not the new green shoots but the little bit firmer thin branches that have darker bark. Take multiple cuttings to have a higher chance of success.
Basically you cut pieces af about 10-15 cm and stick them half way into a pot. It is important that the direction in which they where growing is the part above ground.
- Keep the ground moist but not wet.
- Do not put in direct sunlight.
- Covering the pot with a plastic bottle or anything that keeps it humid is a good idea
Transplant once they have a good amount of leaves and show signs of trunk growth.
Growing from cuttings is an art in and of itself. There is a lot to be read about it online and lots of different methods. You can even use rooting hormones to help it root better and faster. I suggest looking around and finding one that fits you.
Angelo Eliades over at Deep Green Permaculture does a good job of illustrating the process in this article.
The bonsai part only comes once you have the cuttings successfully growing. There is no special way to start when wanting to grow a bonsai. At first they will just be saplings which then over the years turn into bonsai trees as you prune them to keep them small.