Pull weeds by hand, wearing gloves. Grasp the weed near the base of the plant with one hand, then place your fingers firmly on the ground around the plant with the other hand to prevent disturbing the rock bed more than necessary. Water the area first, or pull weeds soon after a rainfall. The long roots are easier to remove from damp soil.
Less Toxic Weed Removal
A rock bed, whether bedrock planted with succulents and wildflowers or a rock garden, can be an attractive, low maintenance space. No mowing required. However, many types of weeds are persistent and continue to sprout, even in bedrock or in the nooks and crannies between boulders. To get rid of the overgrown weeds in your rock bed, try manual controls or one of several non-toxic methods first because safe techniques may remove established weeds effectively without dangerous chemicals. Resort to herbicides only when nothing else works, and then use a chemical exactly according to the instructions on the label.
Chemical Control of Weeds
Eliminate weeds with homemade weed sprays. For example, make a spray consisting of 1 ounce of vodka for every 2 cups of water, then add a few drops of liquid dish soap. Spray weeds on a hot, sunny day because the spray isn’t effective in shade. You can also spray weeds with a combination of up to 5 tablespoons of rubbing alcohol in a quart of water.
The good news is, killing weeds in rocks is not much different from killing weeds in the garden and lawn.
Systemic weed killers destroy the weeds from the roots. They are good for eradicating perennial weeds, like bindweed, ragweed, dandelion, and others.
Organic Or Non-Organic?
Mix rock salt with hot water in a 1:3 ratio. Add a little bit of liquid dish soap to it. It will help break the surface tension of the water and increase the absorption as a result.