how to stop weeds growing between concrete slabs

How to stop weeds growing between concrete slabs

Moss and weed killer is available from any and every garden centre. It is an effective and simple treatment to remove a huge bulk of the weeds from your patio. However, it’s important to remember two things: 1. These chemicals often don’t differentiate between weeds and the plants you want in your garden, so be careful where you are spraying; 2. It will not stop the ground from being fertile enough for weeds to grow, so ideally you need to follow up the chemical treatment with a physical removal of any soil in the foundations.

If you don’t like the idea of using herbicides on your garden, then it’s worth considering some natural alternatives that will likely do a good job. There are methods everywhere online demonstrating using vinegar, salt or baking soda to kill weeds and all are fairly effective.

It can be a fantastic option to scrape the time-weakened cement from between your slabs and replace them with a resin-based compound such as Joint-It simple . Not only will it improve the look of your patio immediately, but it will provide a new, strengthened, weed-resistant (although not entirely, remember!) joint for your slabs in as little time as a single afternoon. It is a good option to consider.


A billhook and a thinner, smaller knife where needed will be perfect for getting the weeds out from between your patio slabs. Wet down the entire area to soften everything as well as the soil underneath. Get your gardening gloves on and pull out all the weeds you can get your hands on. Anything left that you can get to by hand, use your billhook to scrape them out. If you are re-grouting with Joint-It as mentioned above, get the billhook stuck right in there and scrape out the remainder of the weeds as well as any gunky soil parts that are loose too. Add a little bit of sharp sand before using the jointing compound to finish. This should keep your patio weed-free for years!

Weeds are a persistent part of nature that are the bane of so many keen gardeners’ lives. Popping up where you do not want them, getting in the way or siphoning nutrients away from the plants you would rather grow instead. Weeds can come in all sorts of shapes – even your lawn is technically classed as a weed – but often the most unwelcome are the ones that end up growing between your patio slabs. They are unsightly and can even lead to structural damage if left too long. So, what is the best way to stop weeds from growing where you don’t want them?

Natural “chemicals”

There is a plethora of products that are excellent for keeping weeds at bay. From chemicals to tools to jointing compounds. And it is these that we will focus on here. Jointing compounds are a resin-based sand product that is brushed into the gaps between your slabs which then sets rock solid over 24 hours. It provides a firm joint between your paving slabs that are much more effective in stopping weeds than a purely cement-based option.

We wish we had better news. But the long and short of it is that weeds will continually grow wherever they get chance and will always find a way eventually. So, we are going to explain the best methods we have found of slowing the spread and keeping on top of it, you will just have to be aware that there is no magic cure. We have found weeds that have grown on top of artificial grass as one of their spores had landed on top of the turf and managed to root and grow. They are persistent, but there are methods to minimise their impact and make sure they do not ruin on the constructional element of your patio.

How to stop weeds growing between concrete slabs

Weeds seem to grow virtually anywhere, even poking leaves out of cracks in concrete expansion joints on driveways and sidewalks. While newly laid concrete doesn’t have such problems, settling produces cracks after several years, allowing weed seeds to gain a foothold. Although hand pulling will temporarily remove this unwanted greenery, sections of roots often remain, allowing weeds to regrow.

Chemical, Organic Controls

To avoid regrowth after pulling weeds, spray commercially available weed killer into the cracks. If you are concerned about the effect of chemicals on the environment, however, a number of organic options can kill weeds. Applying table salt to the cracks will make the soil underneath chemically unbalanced, causing weeds to wither and die. Pouring boiling water on the weeds and in the cracks might also be effective. Another solution is a mixture of 1 cup table salt dissolved into1 gallon household vinegar and 1 tablespoon dishwashing detergent. Spray on the weeds and repeat as necessary.

Sealing the Cracks

Filling the cracks is another, possibly more effective alternative. For an organic solution, try shredded bark or pebbles. Polymeric joint sand, a mixture of regular sand and resin, solidifies to a mortar, blocking air, water and light from reaching weed seeds and roots.