Though ripe seeds have dried to the appropriate state internally, it’s still prudent to remove surface moisture by air-drying them indoors before storing. Spread a single layer over a plate or tray. Label each crop. Leave the seeds in a cool, dry place for two or three days, then pack them into labeled envelopes and store in airtight containers in the refrigerator. The “airtight” part is crucial; if your seeds take up moisture in the fridge, they can deteriorate.