A lot of commercial crops are grown from plants modified to produce no viable seeds. If that's not the issue you could always try starting them indoors and then moving them into a bed once they are stronger.
I suppose tbh I don't actually know the mechanism by which those seeds are produced. That's why I suggested starting them in an enclosure of some sort. Not even necessarily indoors but even putting a mesh cage over them, It could also be any number of other factors. I've only grown from starts.
A lot of commercial crops are grown from plants modified to produce no viable seeds. If that's not the issue you could always try starting them indoors and then moving them into a bed once they are stronger.
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I suppose tbh I don't actually know the mechanism by which those seeds are produced. That's why I suggested starting them in an enclosure of some sort. Not even necessarily indoors but even putting a mesh cage over them, It could also be any number of other factors. I've only grown from starts.