You can spend time trying to repair it but it will cost you more time than it might be worth. If you are determined you could try a heavy bag or even cut up an old tarp.
Take a look at these ideas....growing tomatoes in
buckets, here's some more
buckets, and simply planting the tomatoes in
bags of soil and hanging in a net!! All easy, potentially free (provided you scrounge some buckets) and will last years.