weed control

Hi

I have just got my 1st ever plot, and its over grown so my plan on Monday is to just it all back down and strimm it as short as poss then cover it with black plastic to kill off weeds

Im not planting at all in 2017 im just sorting the plot for next year

Whats the best black plastic to use to kill off the weeds ?

Below is a picture of the plot

Thanks

http://chat.allotment-garden.org/gallery/57712-210617153408.jpeg