Weeds and moss grow between my paving slabs. Is pulling them out enough?

Weeds and moss aren't the cause but the sign. They grow wherever there is soil and damp: in joints that have emptied out, in cracksCrackA split or gap in render, concrete, a wall, a coating or wood. Fine cracks are usually only on the surface; ones that grow, keep reopening or run diagonally need attention. and where water sits after rain. If you pull them out without closing the gap, they come back. And as they grow, their roots open the gaps further.

On this sidewalk moss had spread across the whole surface and weeds were growing in every crack, because the surface had broken into pieces. There, cleaning alone made no sense: new concrete was laid along the whole length so no gaps were left. In a stone courtyard, on the other hand, the stones were sound and it was enough to fill the joints again.

If the slabs sit firmly, the fix is to clean the soil and roots out of the joints thoroughly and fill them with new material. If the slabs rock or have broken, those need fixing first.

Moss needs attention for another reason too: it makes the surface slippery, especially in the rain. If it always appears in the same spots, water is probably sitting there, and it's worth checking whether the floor has the right slopeFalls (drainage slope)The gentle slope built into flat roofs, balconies and bathroom floors so water runs to the drain or gutter instead of pooling..