65p Salt Hack Kills Driveway Weeds Overnight, Says Garden Expert

A viral TikTok hack prevents weeds from growing in between concrete areas such as patios and driveways – for good.

Garden experts from PriceYourJob has debunked the viral TikTok hack, which uses an ingredient costing just 65p from your local supermarket – and even better? You’ve likely already got it in your kitchen cupboard. 

The TikTok hack, originally shared by Dr Janine Bowring, shows mixing 1 part salt to 2 parts water, stirring then pouring over weeds growing through driveway and pavement gaps to kill vegetation. 

The science: Why does salt work so well as a weed killer?

Harry Bodell, garden expert at PriceYourJob, upon spotting the method, debunks the hack: “This method works by ultimately dehydrating weeds. Salt interferes with the weed’s ability to absorb essential nutrients such as potassium, magnesium, and calcium. The disruption in nutrient uptake weakens the plant’s overall health, causing it to dry out from dehydration and die.” 

“The salt method prevents further growth of weeds. There are certain ions present in salt which can be toxic to plants when accumulated in high concentrations and interfere with natural processes such as photosynthesis, leading to cell damage and dehydration of the plant.” 

Garden expert shares how to use salt water solution to kill weeds effectively overnight

Once you’ve prepared your salt solution, lightly pour the solution over gaps in between paving slabs on garden paths, specifically concentrating over areas that have weeds currently growing through. It’s important to do this on a particularly dry day so humidity and rain don’t wash away the solution.

Overnight, the solution will work on drying out the plant to the root, making the weed easy to remove the next day. 

However, Bodell also recommends using the solution sparingly to avoid it affecting other plants: “While salt can effectively kill weeds, it can also accumulate in sand and soil and affect the growth of other plants. Use it sparingly and only in areas you wish to have no plants growing through, as it could impact the future growth of other plants.”