Hi Jania,
We have the blackberry problem too......although ours are raspberries. I think the man who who first built this house and landscaped the property planted a big patch of raspberries. Now they are EVERYWHERE. We sure have lots of protection for small animals and birds here! We also have dozens of big brush piles from the tree branches, vines, honeysuckle, etc., etc. that we've collected over the years. I sometimes refer to this place as the "land of a thousand brush piles". haha We have lots of names for this place that aren't very complimentary. But at the end of the day, we have to say we love it.