The idea behind ‘no grow’ bird seed is simple, and there are different methods of preventing seeds from germinating, without, of course, affecting the inherent nutritional value of the bird seed.
The main method is known as cracking. This is when the seeds are cracked, and thus by damaging the seeds’ mechanism for active growth. It’s not possible for cracked seeds to germinate.
These seeds, although cracked, still maintain all their nutritional integrity so your birds will get 100% of the goodness from the seeds.