LOts. It was a rural area, made up mostly of life-style blocks on the outskirts of Whangarei, that backed onto a scrubby mixture of manuka/kanuka, wilding pines, and lots of Acacia, with a pig fern undergrowth (you can see the scrub in the sattelite image). There was some recently cleared land that was choc-full of Acacia seedlings, so I'm guessing there's a pretty healthy seed bank.