Kari, when you say 'netting', are you referring to what they sell that has openings that are at least 1"x1" square? If so, there is no way that will keep out a squirrel.
Instead, try using nylon netting that you get at the craft/fabric store. It's a fine mesh. The squirrel will have to actually tear through the netting to get at the seeds. But, the netting also allows air and water to pass through with ease.
I now cover all newly planted areas with this netting. It keeps out both squirrel and deer.
Below is a picture of what I'm talking about. It also comes in a wide variety of colors.
And with spring coming, you may be able to get it on sale/clearance. When we had a fabric store closing in our area a couple of years ago, I bought up all of the black, brown and dark green.