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Hi,

I'm looking for some advice regarding my Zelkova. I bought it about 2 months ago from a professional bonsai grower, it had been grown in a greenhouse. The first week and a bit it did very well. (I'm in the Netherlands and that week was a very sunny week). It was a couple of meters away from a window on the South, and growing well.

However, it soon started to lose leaves quite fast. The leaves start to turn yellow and fall of even before they are completely yellow (there are a few leaves with a brown spot or two, but that's a small minority). The leaves do not seem to curl or sag or look otherwise weak and unhealthy (to me anyway). The new leaves and shoots (when it was still growing) were spaced quite far apart and a bit light of color, so I figured it needs more light and moved it closer to the window. I also have two 800-lumen LED (so no heat only light) ligthbulbs that I turn on a few hours a day to try and give it more light.

Also, it has a lot of moss covering, which also grows up the tree trunk. The moss was turning brown, even though I never let the top soil dry out, so I put the tree in a dish with hydro-pellets and a layer of water (the water never touches the tree roots) in order to increase local humidity. I also started spraying a little bit of water in the mornings and evenings.

So the situation now is that there are quite a lot of new leaves/shoots starting to grow (which seems good), but I still have a high rate of existing leaves falling off (of which there are not a lot left at the moment). As mentioned, all leaves look healthy to me, but they start turning yellow all over then fall of quite quickly.
I have already seen however that even some of the new leaves are dropping as well. It's too early to say if the new leaves/shoots are particularly light colored or
spaced far apart. I also have the feeling that some of the new buds of shoots are turning brown/black, but it's hard to keep track of that.

With regards to feeding, I have embedded a couple of pellets of slow-release solid fertilizers.

Could it be temperature? It is mostly between 16 and 19 degrees inside, which can go up up to 20 and a bit on a particularly sunny day (which we have not had many of lately. Not sure how to tell if it is temperature though.

Please advise me what to do, I find it difficult to diagnose any further at this point. I've attached a picture. Let me know if you need any other info.



Thanks,

PS there's a Zanthoxylum in the same room which is doing fabulous, if that information is worth anything..

Have you asked the professional grower that sold you the tree? note, this zelkova probably is not a zelkova but an elm

I would put it outside. You are probably watering wrong, and the roots don't like you at the momennt.

Hi Jeroen and welcome. The solution is quite simple. Take it out on fresh air and good sun. And yes, thats chinese elm as leatherback pointed.

What makes you say its not Zelkova or japanese elm
" Zelkova, originally from Japan and China, is related to the Ulmus genus, which is the genus of the European and American elms. The Zelkova is in fact quite similar to the Ulmus (the Chinese elm), but it has single-toothed leaves whereas the Ulmus has double-toothed leaves. The Zelkova leaves are ovate, toothed and pointed".
Looks like single toothed leaves to me.
Why tell them its not?

If i were you i would put the tree outside where it belongs and leave it alone dont mess with it and it will recover.
Possibly learn how to water correctly you have some yellowing leaves which is a symptom of too much water it takes years to master the skill of watering correctly properly but its important.

Rob_phillips wrote: What makes you say its not Zelkova or japanese elm
Why tell them its not?

Do you know both species? I do. This is not zelkova but ulmus. :S

leatherback wrote:

Rob_phillips wrote: What makes you say its not Zelkova or japanese elm
Why tell them its not?

Do you know both species? I do. This is not zelkova but ulmus. :S

And pretty much obvious its chinese elm.

for sure its Ulmus (I have both, for more than 10 years)
Looks like a root problem, maybe to wet? That in combination with his new surroundings (less light?). You should get him outside, in semi shade, and see if he's recovering.

Thank you all for the advice. It has been outside for most of the time last week, I resist watering it until the topsoil is actually pretty dry, and it seems to be doing much better already. It has been very sunny, which probably helped as well? Avoided too much direct sunlight in the middle of the day and on particularly hot days.

One question though; the moss is not looking very nice anymore. How do you balance not overwatering the tree with keeping the moss lush? If I would spray the moss with a little water daily, would that be detrimental to the tree?

jeroen wrote: One question though; the moss is not looking very nice anymore. How do you balance not overwatering the tree with keeping the moss lush? If I would spray the moss with a little water daily, would that be detrimental to the tree?

Please forget about the moss and concentrate in making your tree healthy.

jeroen wrote:
One question though; the moss is not looking very nice anymore. How do you balance not overwatering the tree with keeping the moss lush? If I would spray the moss with a little water daily, would that be detrimental to the tree?

Gently spray the moss with mist spray, enough to give wet to it but water not going down the pot.