My plants are getting mold on top of the soil I don't know why

We need more information, Pam. Containers? Inside or outside? What does the 'mold' look like? Excess rainfall an issue? Sunlight or shade?

Pictures of the 'mold' would be helpful.

could also be accumulated salts .. rather than mold ... do you fert.. and when was the last time you changed out the media ...

ken

Mold on potting soils is an indication that the potting soil is too wet, either from watering too much or poor drainage.

http://homeguides.sfgate.com/dustylooking-mold-soil-houseplants-41109.html

kimmq is kimmsr