Leftover seeds lose viability faster than most people assume if they sit in a warm drawer. Cool, dark and dry conditions matter most, and an airtight container with a silica pack in the fridge has kept mine usable for a couple of years. There are storage notes on
https://budweedseeds.com that also mention avoiding frequent temperature swings from opening the fridge constantly. Freezing is debated, and I personally would not risk it without proper sealing.
