Leaving your potential survival garden to chance is something you don't want to do. Get started now while you can still learn by trial and error. No matter how much knowledge you have about gardening things can still come up and ruin all the effort you put into it. BUT if you do plan on storing up a lot of food, you can use your food storage as a backup while you work to get your garden to produce. Either way you need to have the tools you need to work the garden to produce your food. Rakes, hoes, shovels, and any gardening tools need to be purchased now and stored. If you already have most of these tools then buy an extra one. If your shovel breaks and you can't go out and buy a new one you will regret not purchasing a backup. A seed pack is also important to have. Most of the "survival seed vaults" you can buy include years worth of heirloom, non-hybrid seeds. This means you can extract the seeds from your harvest and plant them the following year.
As a prepper you want to cover all the bases and if you don't have an item stocked up, keep a backup. This especially goes for your gardening supplies if you plan on having a garden in the future. A fence around the garden to keep pests out is also important so keeping a bundle of fence would be a good idea because you can't rely on the stores having these things in the event of a disaster. Watering the garden would also be an issue but setting up a Rain Barrel System would allow you to water the garden without dipping into your water storage for your family.
