I refrigerate my seed, generally in paper envelopes rather than plastic bags. All of my seeds. Right now the entire refrigerator door and one of the crispers are full. I do have some vitex seed in the freezer, hoping to get it to germinate somehow or another. I save heirloom seeds from fruit, tomatoes bell peppers and more, but not usually hybrid seeds. I save flower seeds of many kinds wild and domesticated. I'll try anything once