Buy some green onions at the store, use the top green part and plant the lower two inches and you’ll have green tops for awhile until they bloom. They’ve very tolerant to cold and freezes. Also, if you live in a milder climate you can plant potatoes in December and have fresh baby potatoes early in the Spring. Freezes will kill the tops but they`ll keep coming back. This works well in the South.
In Winter you can grow mustard greens too if the temps don’t get any colder than 15 or 20 degrees, at least here in Central Louisiana. As long as you have milder days with temps above freezing they`ll grow well and NO BUGS!
You can plant dry beans from the store as well and you can use celery and romaine lettuce then root the bottom (leave a few leaves and stalks) and they will grow again. You can plant seeds from tomatoes from the store but you never know what type of tomato will grow because they’re usually GMO hybrid garbage - stock up on heirlooms if you can afford it. Free seeds are always great though. They charge way too much for blackeyed pea seeds so get the one pound bag and grow them that way. Most people don’t know this but you can cook and eat the leaves from blackeyed pea plants and they’re very good for you!
Get smart. Get prepped. Survive.