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.
Harlech
Harlech is a seaside resort as well as neighborhood in the north-west Wales area of Gwynedd. Prior to 1974 it was in the historic boundaries of Merionethshire The town lies on Tremadog Bay in the centre of Gwynedd within the Snowdonia National Park. It has remained in the unitary authority of Gwynedd since 1996, as well as prior to that in the Meirionydd Area of the 1974 County of Gwynedd. Of its population of 1,447, 51 per cent constantly talk the Welsh language. Its spots Harlech Castle was begun in 1283 by Edward I of England, captured by Owain Glyndwr, and in the 1480s a stronghold of Henry Tudor. It was improved a high cliff face beside the sea, however shoreline adjustments mean it now exists concerning half a mile (800 m) inland. New real estate has actually been built in the reduced town area as well as in the high town around the buying road, church and also castle. The two locations are connected by a high, winding road called "Twtil".