Finally neatening up my messy seeds. How to save the "winter" seeds
for next year? Radish, bokchoy,
spinach, lettuce, sugar peas, carrots, etc.

Is there any REAL evidence -- not anecdotal -- that storing in the
freezer will preserve viability better than refrigerator or just shelf
storage, esp. during warmish summer and mild autumn.

This is mild Mediterranean climate - So. Calif coastal.

I want to cut down wasting money on seeds, since I often don't use up
a whole packet due to lack of space, and would like to keep for later
if practical.

TIA