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.
Boncath
Boncath is a village, community and postal district in north Pembrokeshire, Wales. It is positioned about 5 miles (8 km) to the west of Newcastle Emlyn. The village stands at a crossroad joining the nearby settlements of Newchapel (Capelnewydd), Eglwyswrw, Blaenffos and Bwlchygroes. Previously a hamlet around an inn, the village developed following the creation of the railway in 1885. Boncath railway station, which opened in September 1886, was a two-platform stop between Crymmych Arms and Kilgerran Halt on the Whitland and Cardigan Railway, known as 'Cardi Bach'. The line was shut due to the 1963 Beeching Axe and the station building became private property. The village once included three tailors, a cobbler and also a dressmaker, and in 2000 a new Community Hall was created. Cilwendeg House, described as one of the most important mansions in Pembrokeshire, dates back to the late eighteenth century and was constructed on the site of a former home dating back to the 1600s. One of numerous features of the property is the Grade 2 listed Shell House, built in the late 1820s. The 21 bedroom mansion was a care home from 1952 to 2010. Currently, the village boasts a permanent population of about 700 inhabitants. The town is served by a regular bus service. The Boncath Inn is found in the centre of the village in addition to a village shop and Post Office, as well as a variety of small companies. The Welsh Independent Chapel at Fachendre (Fach-hendre), created in 1879, can be located towards the south east of the village and is a listed building. The Community Hall, a registered charity, offers a space that can be used for events within the area. Cilwendeg was the location of the 2013 Urdd Eisteddfod. For all your home improvement projects, make certain that you select vetted specialists in Boncath to ensure you get a good quality service.