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.
Marazion
Marazion is a civil parish as well as community, on the shore of Mount's Bay in Cornwall, England, UK. It is 2 miles (3.2 km) east of Penzance and also the tidal island of St Michael's Mount is half-a-mile offshore. At low tide a causeway connects it to the town and also at high water passenger watercrafts bring visitors between Marazion and St Michael's Mount. Marazion is a growing traveler resort with an active neighborhood of musicians who generate and also sell paints as well as ceramic in the town's art galleries. Marazion lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Nearly a 3rd of Cornwall has AONB classification, with the same condition and also protection as a National forest. On the western side of the town is Marazion Marsh, a RSPB reserve and also a Site of Special Scientific Interest (SSSI).