As always, use multiple reference guides before eating any plant.
Hostas are considered ornamental in Canada but they’re considered an edible leafy green in the old world. The plants come back year after year (perennials) and they grow with little attention and do well even in the shade.
You want to harvest the hostas before they unfurl, so early spring.
Small hostas can be added to stir fries as a bok choy substitute.
Larger hostas can be an early substitute for asparagus by boiling them first.
Opened hostas can be used as a substitute for spinach-type dishes.
Snap the leaves off near the base. The hostas should rebound later in the spring.
Hostas are a good addition to a permaculture, forest-based garden in rich soil in the shade.