Most people find that, in order to grow food, they need some sort of structural element to support the process.
It's most likely to be wildlife exclusion. Especially here in Tasmania, most food-growing projects need at least some defense from either wallabies or brush-tail possums, or both. Birds can also be a problem, and to a lesser extent, so can domestic animals like dogs and chooks.
Steep ground can also present a problem, so you may need terraces and retaining walls. You may also benefit greatly from raising your growing beds above ground-level, depending on your situation. (This is so common that many people believe it to be necessary. In many cases its not necessary, but it may be a good choice anyway—it's always good to think strategically before settling on a structure.)
Please note, though, if you're lucky enough to need no structures at all, that's what we'll recommend. We'd never try to sell you something you don't need.
We have no set products or repeat-structures. We design something to suit your needs. But don't let the word 'design', with its usual fancy connotations, put you off. This isn't some elaborate, expensive process. Design, as we practice it, is as down-to-earth as building. Its just thinking smart about what you're going to make, before you make it.
The most likely design recommendation we'll make, for starting out with food gardening, is to make something flexible and adaptable. Not always—some situations suit a more permanent structure—but commonly when you're starting out, you won't know exactly where the journey will take you.
But many people don't realise that they can have something that's not set-in-stone permanent, or else they think an adaptable-later solution is likely to be flimsy, not of robust quality.
You can have adaptability and robustness in one structure, and that's the design strategy we often recommend. And that doesn't mean great expense, either. One of the reasons for our build-it-with-your-friends-and-family program is that it allows skilled designs to be implemented with unskilled labour, keeping costs reasonable.
In any case, whatever your situation, we'll find a sensible and affordable strategy for whatever structure is needed.