I wrote in the old site about my forsythia problem... I couldn't stop it! The lady next door sold the house and the new owner hated it so he cut it down to the ground. He's not a gardener (a pull up everything that's growing
with roundup kind of guy) and he's been spraying it now for two summers.. and it still tries to grow. I guess my point is... watch out what you wish for. It's invasive. It spreads from roots and/or branches (where ever they touch the ground) and becomes enormous. I had to cut it back to keep it out of the above ground wires coming into the house.