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Hello

My first post here! I have bought a japanese black pine bonsai kit and I was wondering if you could help please. Note also that I am a total beginner not only in bonsais but in gardening in general.

The kit had 5 seeds which I planted about 6 weeks ago. All 5 have now sprouted and grown quite a bit, see attached photo. I understand that I now is a good stage to separate them and keep each one in its own pot. What kind of soil should I use please?

Also if you have any other advice (for example should repot/separate them or how they look to you etc...) please feel free.

I live in London, UK

Many thanks!

Hello and welcome.
I'll try to answer your questions but bear in mind that questions like yours are asked here frequently so the search button is your friend too...
First of all: 5 seeds en 5 sprouted: well done. A lot of people get one or nothing out of these kits.
Second ( and this is a big one) : they need to be outside or they will die, without a doubt. Being in london there will be no frost untill late autumn andby then they will probably be strong enough to survive the winter. For now put them in the shade and gradually give them more sun ( morning, morning and evening, full exposure)
Third: i do hope you understand that normal trees will grow out of these seeds.. so start studying about how to grow bonsai from seed. If you continu with them you might have something vaguely looking like a bonsai in 15-20 years... ( tip : they dont become bonsai because they are planted in a small container/pot, au contraire...)
If you dont have any gardening/horticultural knowledge i suggest you start with that ( iow how do i keep them alive). the first 5 years or so there no bonsai work to do anyhow.
You can seperate them now, or wait a bit till they are climatised outside, into a good substrate ( use the search button).
Summary: outside- study study study study.....