1. I brought this for 50p at the garden centre but i don't know what it is. I thought it was some kind of phlax but it has 4 petals and phlax usually has 5, it has a very strong rose sent.

2. loads of these tree like weeds grow all around my garden. they are impossible to pull up completely as the roots seem to spread some distance, does anyone have any suggestions as to what it is and how i can kill them.