How do I prevent mildew on top of soil?
I hope someone can help me in this matter.
This summer, I brought my Ming Aralia, an indoor plant, outside. It leaned a lot but it seemed to tolerate it otherwise. Being outside, it needed more water. When I brought it back inside once fall arrived, a week later, it developed mildew just on the top of the soil.
So I repotted the Ming in a brand new pot, changed the soil, and watered it once more. Because it's inside, I placed it back on its normal watering schedule (about once per week or so). After a couple of weeks, mildew began to develop on the top of the soil again.
So I removed the mildewed soil, and didn't water the plant (this was a few days ago).
And now, mildew is developing again.
Can anyone tell me why, and what can I do to prevent this from happening?
The Ming is in the same spot indoors that it used to occupy before, and it was fine for years. I'm not sure what's happening.
Thanks in advance to those who can help :-)