How to stop bird seed sprouting?

I have been using the Gardman No Mess seed mix (which I had also assumed was no grow) and liberally chucking it all around the garden for the last couple of months.I now have seeds sprouting all over the place,its a nightmare!!!

I have heard that you can treat seed by cooking in the oven,has anyone done this and does it work?

I have made up my own no grow mix (peanut granules,suet pellets,mealworms etc.) for the ground feeders but liked the seed mix for the hanging feeders.

Rachel

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