Squirrel Control

I have some pots out by my stoop that are planted with marigolds and hot peppers. It's a nice sunny spot and as long as I'm diligent with the watering, things should be fine. However, the pots are under attack by some nosey squirrels that just can't seem to resist digging in the dirt. I've lost at least two marigolds and I'm worried a pepper plant could go next. This morning I sprinkled cayenne pepper on the exposed dirt to see if that will deter them. Anyone else tried this or another method of squirrel proofing? The plants are too large for screen at this point.

This afternoon should reveal whether or not my spicy methods are effective.