Storing seeds long term

Dirty Harry

Specifically foxglove seeds. What's the best way and how long can you expect a good percentage of seeds to remain viable?

Assuming in a container in the fridge might be the best bet?

josusa47

How long is long term?  I can't see why you'd want to keep them more than a year, since you could collect fresh ones every year?  As a general rule, the smaller the seed, the longer it stays viable, so Digitalis probably would keep a few years in a paper packet in the shed.  Just don't put them in a plastic bag; they need to be able to breathe.

Dirty Harry

More if I had a particular variety I wanted to keep using because I couldn't guarantee the collected seed as coming true.

BobTheGardener

If you decide to store them in a fridge then you need to use an airtight container as fridges remove moisture and will dry them out (ie kill) them.  In this case use zip-lock type plastic bags to hold the seed and expel as much air from the bag as you can before sealing in something like a tupperware box and putting in a fridge.  Seed banks do exactly that but freeze the seed to -20C which is the temperature that home feezers are ideally set at, so you could potentially keep them for decades if you have a freezer.