Bramble is a tough colonising plant and is notorious for rapid growth of stems, which reach out from a hedgerow to colonise new ground - they are unusual in that when they touch the ground the tips can form new roots and start a new plant.
These rooted branches are called ‘stolons’. It is easier to cut off and transplant a rooted section rather than to grow plants from seed.
Brambles have flowers that are attractive to insects, and the blackberries provide food for insects, birds, and mammals (including humans!)
If you need to cover rough ground, which cannot be cultivated, brambles are an excellent choice.