Your survival will depend on your ability to gather and produce your own food. You can’t let pests overrun your garden, as you need that food for your family.
While you may still want to add other plants later on, never forget to see what is available in the “weed” category, or others that may not be easily recognized.
Take time to learn what plants around you are nutritious. Otherwise you will be at a disadvantage when disaster strikes, and you can’t buy produce at the local store.