how to save seeds from home grown courgettes

Question

How big does a courgette have to be, that its seeds are viable to sow?

Answer 1

It's a good question, but I don't think the size of the fruit is necessarily the determining factor for harvesting viable seeds. "Courgettes," also known as zuchinni squash, are usually harvested while they're small and tender. I'm attaching a link to a great article about squash seeds.

https://www.gardeningknowhow.com/edible/vegetables/squash/squash-seed-harvesting.htm

There is a specific process involved that should help you determine which seeds are viable.