https://www.amazon.com/Seed-Growing-Techniques-Vegetable-Gardeners/dp/1882424581
This is the compendium with techniques for crops and lots of other things, and even includes recommended population sizes to ensure you do not end up bottlenecking genetic diversity and getting genetic drift or losing productivity because of it. Very important to know what will cross and what won't in certain crops, and the extra steps required to ensure purity of a strain or isolation distances.
For your peppers, I believe you can still save seeds if you're okay with putting in a bit of extra garden time. When you see flowers coming in, wrap them in a small mesh bag, maybe something like this . Once they've bloomed, you can hand pollinate from the flowers of the same plant and mark the fruit so you know which ones will have true seeds. Ofc not feasible for all your peppers, but if you've got some rarer varieties you'd like to save extra seeds from it's a helpful method! If you're more worried about wind flow than pollinators getting to the flowers, I'm sure you can use a more airtight bag although you'd have to watch out for rotting of course.
I'm interested in your paw paw seeds, but I don't have any Romanesco. I do have yin-yang beans that I'm willing to trade. here's a link to what they look like: ying-yang beans
Made a list of wants, no real urgency for any of them. LMK what you're able to do and I can curate a pepper package for you. DM me your address when able (I recommend using privnote.com).
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My address is: xxxxx (did not mean to post here)
Send me your addy and I will get the butter beans and parsnips in the mail. The butter beans were one of our favorites this year. I had to fight my 6yr old son over who got to ear more. We cook them down with some stock and maybe some ham...yummy.
The butter beans are from Sothern States and are called "Dixie Butterpea". They are a bush bean and stay pretty low to the ground. The parsnips are from a variety pack of seeds I ordered from here - https://www.amazon.com/gp/product/B00LE4RGOE/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
The germination rate has been fantastic for the seeds that came out of this pack. Dave.
3 of these (link below), seeds group by family, kept in seed pouches secured by rubber bands
I've been trying to grow passion fruit from seeds for like 3 years and I've had no luck. I just gave up and decided to order a cutting from here
Check your library for the seed saving bible: