You should pull up and remove weeds by hand as and when they appear. If it is a regular problem, you might need to reseal the paving. In extreme cases, the sub layer itself may need to be re-laid. You can use weed killer, however some paving can be discoloured by stronger weed killers.
Talsarnau
Talsarnau or Talsamau is a town and also neighborhood in the Ardudwy location of Gwynedd in Wales. Its population of 525 (2001 ), enhanced to 550 at the 2011 Census. The town of Talsarnau is located on the A496 seaside road in between Maentwrog and Harlech, close to the communities of Eisingrug and Llandecwyn. It has one primary school and one bar, "The Ship Aground". Talsarnau railway station on the Cambrian Line serves the village. The neighborhood additionally includes Ynys Gifftan.