Bonsai moss yellowing and browning

I have a new crape myrtle bonsai. It's been about three weeks and my once beautiful green moss has turned a sickly yellow brown. It sits on a window sill and gets a decent amount of summer sunlight. I originally watered it every day according to instructions but stopped when crape myrtle tree started dying and I was told I was over watering it. In that time, I have also sprayed my bonsai with detergent water to get rid of the aphids and soil bugs. I have also sprayed the bonsai with an organic fertilizer. Can anyone please tell me which of these is the cause of the moss dying? And if I stop doing this, will my moss return to its original color or is it non-revivable at this point?

Thanks!

You are facing a hard road ahead.

1. Crape myrtle will not do well for long inside. They NEED to be outdoors.

2. Neither will moss -- or, as you have discovered you will have to keep the moss so damp that the tree will suffer.

Generally speaking, many of us prefer to keep moss OFF our trees, if possible, except for a show. A good moss cover means the soil is pretty damp and most trees don't like it.

Lots of things here

1. Moss is attractive on Bonsai but usually good moss health and good bonsai health don't go together. When we show trees we might add moss but otherwise we don't want it.

2. Bonsai are outdoor trees, your tree should be outdoors when the temperature is above 32F.

3. BTW, Crape Myrtle will loose their leaves in winter.

4. Don't spray your tree. You only have one, pick off the bugs.

5. The soil bugs come from the over watering.

6. If you need to fertilize just pour it on the soil instead of your regular watering.

7. Use a meat skewer or chop stick to check for soil moisture. Don't water if the soil is wet.

Look carefully, was it real moss or just dyed fine wood strips?
Florists also use a dyed fake moss.

You may wish to get about 10 more plants to work with, and not kill the one with over love.
Later.
Khaimraj

You might also consider that "florists" are unlikely to know a lot about bonsai. WSee our book reviews in the Top Posts and Tutorials section.

My wife is the exception.  She is a florist and knows waaay more than she wants to know about bonsai.