New World Little Gardens

I have some left over little gardens from last year I want to grow with this years, I have noticed white specks (maybe mould but not sure) on the soil disk, are these spoiled or can they still be used?

The soil tablets should still be fine if they've been stored in a cool, dry place, as there best before date is 12/11/2017. We have just planted some 2016 Little Garden seedlings that we found lurking in the cupboard and they're all doing really well.  Good luck and don't forget to share pictures of your Little Garden growing with us here to be in to win a $200 New World Gift Card.