Hi I want to make this beautiful fushia bonsai eventually. It's still very young. I'm wondering at what age/size do I start training and shaping?

If you want to create mowement using wire you can start now and up until the trunk is too thick to bend.

Everything else depends on what you want create. "A bonsai" is just not enough information. How big tree, what style and what tecqnice?

Oh, yes.....Age is not a good guideline for when to do certain things to bonsai even if you know your goal with the tree. Trees grow very differently based on care and climate.

If I were to create a bonsai out of that material I would leave it in that pot for quite a wile to mature. I would never keep it in living room conditions, but outdoors in summer and frost protected in winter. That is for fast development and health. I would not wire but go for clip and grow. I would let it grow freely until it reaches a meter. Then look for a possible new leaser far down and make a big trunk shop. Repeat 3-4 times for taper. When I am happy with with the taper, deside the final design based on what I have and start branch selection. Depending on how many branches that needs to be remowed I would make it in 1-3 years. After that put in a suitable bonsai pot and start on ramification.

That would take a while. My mother have a fuchsia 15 years old that are a meter now. But just 2cm thick.

Thankyou I didn't realise they take so long to thicken....I had it in the ground but it was getting scorched in this hot aussie sun. I'll try to find a shade spot for it outside. So can you please tell me whilst I'm patiently waiting years for this to thicken....what are some species that develop more quickly?

I live in Sweden, so quite different conditions. The best species to grow for bonsai is the ones native to ones local area or locally hardy garden center materials.

I have read that the Australian tea tree is very fast growing. However not in my conditions. Other than that I have no experience with Australian species.

Pines seem to thicken up quickly. I have no success with them, but they are popular.

For any species, the more foliage the thicker the trunk becomes. Sun, water, lots of room for the roots to grow, and decent amounts of fertilizer. You should study the particular species to see what sun would be too much.