Preventing weeds

To prevent weeds from growing and to water your plants less often, use some mulch to cover your plants. Not only will it help to get rid of weeds, but it wall also enable you to water less as it protects the soil from the wind and sun. It will also help against flooding.
Some mulches produce humus which is great for soil.
Finally, you may also use some special plants which will help get rid of weeds. Find out more in your local garden center.