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I have a 7 year old Chinese Elm bonsai. So far it has been growing new shoots without any problems. As of last week I noticed most of the leaves of the old shoots have started going yellow at the center and brown at the tip. After a while they become crispy and fall of the tree. It only seems to affect old shoots, as far as I can tell all the new shoots look normal to me. I’ve attached a picture for reference.

single leaf fallen leaves

I normally wait until the soil looks dry (it changes color) before giving it a thorough watering.

Is this natural? Or could this be caused by overwatering? Under watering? Over fertilizing? What should I do?

I’ve also noticed a thin layer of white crust forming on top of the soil.

  • For me it is fertilizing or pH. Note that some component in fertilizers inhibits other components. Could you write more about what fertilizer and how often you do it? – Giacomo Catenazzi May 21 at 10:46
  • I am using Pokon Bonsai plantfood. Mixing 2.5ml into a 500ml bottle and watering with the bottle once every week or so. – Danny Bravo May 21 at 15:24
  • Where is the tree kept? Inside / outside? – AvieRose Jun 24 at 19:35
  • @AvieRose It's kept inside. – Danny Bravo Jun 26 at 6:40

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