However, a clever trick can enable you to use the method more safely.
“If you don’t want to use insecticide or pesticide and you want to use baking soda or vinegar in your borders, you can create your own tools from cardboard,” Mark said.
“So, buy a piece of cardboard and just roll it up to a cone which would fit over the plants, and go around them, so you protect the plants. That way you’ve protected your plants on the outside.
“You can also do a mixture of both. So you could do baking powder with vinegar just to give it a little bit of an extra saturation on the leaf.”