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.
Moelfre
Moelfre is a hill in Wales on the far western edge of the Snowdonia National Forest, 3 miles (4.8 kilometres) from the town of Dyffryn Ardudwy, 5 miles (8.0 km) from the village of Llanbedr as well as regarding 10 miles (16 kilometres) from the town of Harlech. It forms part of the Rhinogydd variety. Moelfre gets to a height of 589 metres (1,932 ft). Moelfre is a prominent peak that divides Cwm Nantcol from Ysgethin Valley. Moelfre is additionally understood for a legend of 3 women who worked with the sabbath and also were turned into standing stones.