I would not use weedkiller on the patio as it could run off and kill plants etc. I use Armillatox Moss & Outdoor Cleaner to treat the moss and algae. It is soap based and does no harm. It smell strong so I do it on a dry evening when there is no traffic to tread it indoors. For the weeds in the cracks I have a wire brush for this with a blade on one side (sold in garden centres) and I use this, once cleared it only needs doing once a year.

Roundup applied by a spray will dry in 5-10 minutes and is then safe for animals.

As above. Roundup all the time. I use use it in a public park and have no problems doing so.

Agree with Andy and Anchorman

We use Resolve, and it kills the weeds very quickly it is similar to Roundup.

I don´t use chemicals at all in the garden.....the weeds on the patio between the flag stones I use the wire brush on a long handle....and the rest of the weeds I just pull out.

I use Bayer Path Weed Control or Pathclear - applied with a fine rose on the watering can to the cracks. Once its dry, its harmless to any visiting animals. It will kill off what's there, and will have a residual effect in the gaps between the stones, preventing regrowth for up to 3 months, so do it in May or June, and you don't need to do it again till the following year. Intended for paths and paved areas, not for planted borders or open soil.

thank you so much for your replies about weedkiller.i actually have roundup but have been a bit apprehensive about using it,i think i will get one of those brushes too.

Hi ya,
I have one off them weeding lances that uses a butane canister and you wander around BLITZING weeds with a mini flame-thrower. It keeps me a reasonable distance from the kitchen sink one or twice a week :-)