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I repotted my Bonsais in one shared pot, they are from different types. Is that a problem?

Sorry for the newbie question.

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It depends on which species you're working with. (The one on the right side of your photo looks like a Ficus (?), but I can't place the other.) If one is of a much more aggressive species than the other, then the less aggressive one could end up crowded out or even poisoned. For example, oaks secrete tannins into the soil around them to suppress the growth of competing plants, but the amount and exact chemical mix is determined by the species of oak, and how effective they are depends on what the other species is. (Check out allelopathy for more on plants' chemical warfare.)

On the other hand, group plantings of compatible species have a long history in the bonsai tradition, where they're part of the subset known as penjing.

If you read up on your specific combination of plants and decide you want to keep your trees isolated but in the same pot, I recommend using a plastic divider of some sort. Cut an empty container that you'd otherwise throw out/recycle into the shape of the inside of the pot, and use that to separate their roots as much as possible. It won't be perfect, but it's better than nothing.

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    Many thanks for the answer it’s very helpful reads. – Wazery Jun 21 at 18:36

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