Our library does this! Our porch is crap for growing things that don’t thrive on blazing heat and a mix of high UV for 4-5 hours per day and shade, but it always makes happy to see what they’re offering up. There’s a cool local wildflower conservation org that partners with them and other libraries here.

Originally seed libraries were banned in Pennsylvania but courts ruled that they are not illegal .

I already donated a bunch of seeds to my local library (and picked some up myself). Honestly, I need to see if they are planning on having any kind of seedling exchange because I have more than I'll be able to plant.

I normally try to start a decent amount of extras to account for seedlings that die, or seeds that dont germinate, but I got really good germination this year thanks to a heating pad.