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Hello,

I have purchased this sweet plum couple of weeks ago. I pruned it and shaped the branches and did no repotting since the soil was in good shape. I spray for humidity every day (hot summer in Romania) and water generously when the soil gets slightly dry.
Placement is on a south east facing window, with direct sunlight in the morning and indirect sunlight after 12PM.?

Since the weather is pretty hot with low humidity another bonsai - chinese elm - dried out completely and the new sweet plum has some dried out, paper-feel?leaves with light brown spots and darker brown dots. A bonsai expert in Romania told me to go for some pesticides for red spiders and flea.?

I have two more bonsais, a ficus ginseng for 2 years and a dwarf jade - crassula which are both doing fine.

Any tips to save the sweet plum are very welcomed!

Thank you!

The Chinese Elm and the sweet cherry must be outside. That is what has killed them, you could put them out water and hope.

Thank you for the reply!?

In Romania the summer is very intense, with low humidity and intense temperatures 38 - 45 degrees Celsius (100.4 -?113 Fahrenheit). The placement of all my bonsai is in the balcony, which has air and temperatures similar to the outside ones.?

The care guide of?The Sweet Plum or Sageretia Theezans from 名媛直播 Empire states:
" The sageretia likes a semi-shaded place outside during the warm summer, but it can also be kept indoors all year round. Indoors it should be placed at a window facing south or west, but it needs protection from intense sunlight. "

So, based on that, i cannot provide a semi-shaded place or protect it from intense sunlight, not to mention the air pollution.

What else is there to do??

The key words is "kept indoors". That is a common claim from many sellers about indoor bonsai. They do not claim they can be developed indoors, nor do they claim they can be grown indoors. Nobody even claims that they can survive indoors.

I keep my chinese sweet plums in the greenhouse. That is also indoors and more similar to the environment they are produced in than livingroom conditions.?There are a few on the top shelf receiving maximum sun and 40 degrees on hot days and there are a lot on lower shelves that are more shaded and 30 degrees on hot days. Both are doing equally well althou growth is faster and water consumption bigger on the top shelf.

I do have one more mature shohin sweet plum outdoors on my bench. In coastal sweden temperatures above 25c is quite rare. More normal is between 10 and 20 during the growing season.

I hope that it gives you an idea about the span that species can take regarding temperature and sunlight. I think you are focusing on the wrong parameters and that your focus should be on watering. The warmer the more often they need to be watered. A sweet plum that gets dry just for a short time will withering. Recovery is very slow and in most cases they die. Sweet plum is one of the three species I often lose a few of when I am out of town and let my wife water. Nowadays I put them on trays when traveling and tell her to keep 1cm water in the trays at all times. That is not a good long term solution, but works good for survival during 3-5 days when I am out of the house.

So placing them outside or near a window + watering more often could be the solution here ?

I do not recomended growing any tree behing glass in livingroom conditions. It is just to do it harder than it really is.?But, yes. Keep it moist at all times is the key. During bad health and recovery it benefits the tree to be kept in shade. If recovered move slowly into more and more sun until you find the sweet spot for your clone.