Thanks for replying anne, jen, lauren & jay - I hadn't gotten any notification that anyone had replied!
I guess really what I'm looking for is suggestions of any reasonably hardy groundcovers & up to 5m high plants, particularly those that are easy to grow from cuttings or are very successful being direct seeded.
The mound I'm talking about is actually 113m long so yeah a fair space to plant out & money is definitely an issue.
Anne - I wouldn't take the fact that I'm in Australia much into consideration, just happy to hear whatever suggestions might come to your mind! Plenty of european & north american species do well here. We generally don't have extremes of temperature either way, although we are considered cold by Australian standards in Tasmania we are actually in the milder part of the island. (Quite different from where Geoff Lawton is though Jay! But I shall look at the video you mention. One thing I should probably plant for starters at least is tagasaste as it does great here, is fast to establish & will create some shelter for anything else planted)
Jen - Well, perhaps I overstated things a bit. Plants, once you get them in the ground (and yes do some initial watering, at least in summer), mostly seem to thrive. It's just being in pots, I think, when they're so challenged, when you get a warm, windy day (it does get fairly windy here, though less so on the mound I'm talking about as it is near the lowest part of the property and most of it is sheltered from the west, where the predominant winds come from, with a thick Cypress wind shelter on our neighbours boundary). We don't have many, sometimes any, days at or over 30C/86 F even in summer and we're near the ocean.
Lauren - I know it's ideal to do as much local species as you can, however the information on local plants in terms of edibility/medicinal qualities is very scant. I have tried looking into it. The indigenous people here were almost entirely wiped out very early on in the European settlement of the area so that knowledge is hard to come by. We do know of a lot of edible plants but they are generally not things that would provide much of your food, certainly meat/seafood must have been the predominant food source here (plants provide mostly just a bit of flavouring & Vit C), and many are slow growing. Also many are quite flammable, which I don't find desirable!! So while I certainly don't rule out natives I definitely want to look further afield than native species.
Our property is intended to be wallaby proofed, also, for most of it (they will be able to enter the riparian area & dam), as they would make grazing other animals pretty difficult if they weren't excluded as they can quickly reach plague proportions and eat the grass very short (of course that could be considered a resource too, however that is illegal...).