How to hasten the first flowering in Haruka citrus?

[Pancrazio]

About a couple of years ago i managed to get some Haruka seeds from a guy who visited japan. I germinated them all, and got 4 seeds with more than 1 embryo. I registered every plant which came from the same seed, and gave them a code (Seed 1 plant A, seed 1 plant B and so on). So i guess i have the original clone among those. The point is how to recognize it?

Some of those plants had some problems with pot cultivation or my cultivation, who knows. However a couple of complete sets exists today (i grafted some of them on macrophylla too) so the original clone must be here. Point is how to recognize it? I don't have better idea than checking the fruits.  So now i striving to induce flowering as soon as possible in those plants. My problem is that i don't have much space and i can't just put them in ground since my place has routinely temperature till -8°C. What is worse is that i need to confront at least two clones, so whatever i do for inducing the flowering, i must do it two fold. Do you have any idea on how can I hasten the procedure?

BTW Haruka leaves smell is amazing in my opinion, mandarin-like but more spicy, hopefully fruits are good too.

[Laaz]

Normally the most vigorous plant is the clone.

[radoslav]

Standard procedure in Japan is to graft it in top of the crown of big fruiting tree. For some reason, the best place is at least 2,5m high, if I remember it correctly.

[ilya11]

So, it seems that you have at least 8 plants, so can determine a sub-group of true clones that are more or less uniform in appearance, smell and  taste of the leaves.

[mikkel]

Pancrazio how are your seedlings doing?
I received some fruits from Spain. it is a nice variety.