I haven’t sown all of my seeds, will they still grow next year?

Most likely! Store them in a cool, dark place until early spring. To then test them, place 20 seeds between 2 moist paper towels before placing them in a plastic bag. Loosely tie the bag and put it somewhere warm. After 10 days, check for germination. If fewer than 14 have germinated, then the seeds shouldn’t be used.