Yes, if you are willing to put in the work to improve your red clay you can grow sweet corn, squash and pumpkins in red clay. First you must add at least four inches of organic matter such as compost or leaf mold or well rotted manure and work this into the existing soil to improve the drainage. Make sure the planting area is raised to ensure good drainage. Do not plant too early as clay soil holds moisture that will rot the corn seeds. You may also need to add extra fertilizer (I use Osmocote on my veggies) and to mulch the top of the soil once it warms up. I do suggest you contact your local Extension Agent or garden club about more tips for growing food in the red clay soil of North Carolina. A soil test may be suggested as well as specific varieties of sweet corn or other crops that do well in your native soil. Dig in and Keep Growing, Marianne Binetti