Posted: 30/08/2013 at 08:13
I took over a large garden plot for a lady who lost her husband some 4 years ago. The polt was completely overrun with marestail weed which is evil. The first year I double spit dug the whole plot and I took away 8 large wheelie bins full of it. The second year I did the same thing and had just over 5 wheelie bins. The third year I did the same thing and by this time there was considerably less of it but I still had 2 wheelie bins full. This year it is part of my normal weeding process and i have it under control.
What you mustn't do is to dig it over and leave any of it in the ground (the root goes very deep) and certainally don't ever rotovate it as that will increase it substantially. I do not like using chemicals but I think fidgetbones is right about the weede on your tarmac. Monty Don will tell you that it makes good compost but if you do that make sure its good and dead before you put it on the heap!
Hope this is helpful