OK, I have a problem.
About 6 weeks ago I started to plant a new lawn in my garden. I had used a weed killer (round up) a few weeks before, and as all seemed ok, I got the ground ready, hiring the relevant machinery to do so. I planted the seed in my front garden, but then it got windy, so I put off doing the back. Due to work reasons, I didn't get around to planting the seed in the back until the weekend before last. Virtually no weeds had reappeared, so I got rid of the few that were there and proceeded to plant.
Then... I went to Dublin last Friday (I did a trip report yesterday), and got back on Wednesday to see my entire back garden was green... but nor with my new grass, but a jungle of weeds had appeared.
Any ideas what I can do?