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This summer I bought my first bonsai. It's a 12 year old premna japonica (or acer nioi) that's been grown with a root-over-rock technique.
Since this week my leaves are turning very yellow/brownish, and I'm starting to panic a bit;

How can I see if the tree is just turning into it's autumn stage (I read the premna loses it's leaves over winter) or that I'm overwatering/underwatering?
I feel like it's way too early for autumn colours, but weather in the Netherlands has been very bi-polar recently. Is there any way to find out what is up?

I can't seem to find anything usefull yet in my books, or on the internet.. Hopefully someone on here can help me out!

Thomas

I don't have this species, but some trees are starting to turn colour. Just keep watering as normal, checking that it is almost dry each time and it will be fine.

Hello Thomas
I found that this species is named Acer but its not one (had Leaves line an Acer, but only single Leaves not pair like an Acer)
It have located in the Wintertime inside not under 12 Celsius ?? Please, check your Species , but for 12 c you have little more time.

If the Leaves evenly looks all nearly same, not only yellow or brown Spots or Edges and still soft ... can be normal , may show us some Pictures.

If you look on this site under species guides you will find that it is a tropical species and will stand frost to 0C so needs protection in a greenhouse in winter.

I always find it hard to believe when a species is named after Japan and said to be tropical. Where are the tropic region of Japan? There are subtropical regions, but quite sure there are no tropical.

Also fascination to hear about decidious tropical trees. That is very rare and those that exists are loosing leafs in the dry and warm season, not the wet season. As people may know, there are no spring, summer, authum nor winter. Just wet and dry season.

What makes it even more odd is that there are not one botanical trustworthy sourse about this species, just bonsai related sources. I am totally confused here.

I think TS have a premna microphylla. A slightly hardy subtropical species that are semi-decidious. I would care for it in winter as I do with mediteranean species. Very light and frost protected. I don't think it will survive livingroom conditions in winter.

Too bad I have never seen it for sale here so that I can try it out.