Hello - I'm in desperate need of some help. We're under attack.
June 2013 we had a garden that was full of 1m high weeds, the garden measured 16m x 10m. I purchase "Bayer Super Strength Glyphosate" and over 8 weeks gave the garden 2 sprays which killed off all of the weeds.
I then turned the soil in the garden and built it up by 3" using externally brought soil. I then laid Rolawn Medallion turf rolls.
Everything was fine until early Spring 2014 when a patch of the weeds (see pics attached) appeared in one area in the centre of the lawn. I brought some Roundup Gel and began applying it, after 6 weeks & 4 applications the weeds died off. However the Roundup Gel also killed patches of my lawn.
Within days of the weeds dying off, and we thought that was the end of it, we started to see more appearing all over the lawn. Now we have hundreds appearing, there everywhere. They're growing faster than the grass is, I left one grow on the outside of my lawn and the leaf grew to 12" before I dug it up.
I tried to dig one up by the roots, however it is so deep, they appear to becoming from the original ground level - below the 3" of soil I put down before laying the turf.
I'm really lost and not sure where to turn. Our lovely green lawn is turning into a bed of weeds.
Any expert advice appreciated.