🚀 go-pugleaf

The responses I got indicated that you can (1) freeze the leaves whole,
in water, in oil, or chopped up, (2) freeze the plants whole (!) if you
have a big enough freezer, (3) make pesto and freeze it, (4) dry out the
plants and crush the leaves and save them, or even (5) store them
between layers of salt.

Frozen pesto seems to be best if you make it without the cheese, and
either freeze it in ice cube trays or in thin layers in freezer bags.

So basically it seems like anything involving freezing, drying, or
salting will work.