I'm thinking of putting decorative white pebbles on top of my potted outdoor plants. I googled this, and some articles that I found raise several concerns:
- Pebbles in soil increase soil pH, which is not always desirable.
- They make the soil warmer in summer, which might harm the roots.
- Soil with pebbles on top retains moisture better (because it would be harder for the water to evaporate), which is also not always a good thing.
How valid are those concerns? Can decorative pebbles actually do harm?
I found this answer https://gardening.stackexchange.com/a/19392/25919 that addresses the 3rd point.