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There are organic herbicide options that will kill grass but not flowers, including white vinegar or a dish soap solution. Commercial selective herbicides can also target grass over other plants, but read the instructions carefully to avoid damaging your garden. Herbicides that kill grass but not flowers usually include ingredients like clethodim and sethoxydim. Otherwise, your best bet will be to weed by hand.

It’s best to pull weeds when the soil is wet, as it’s much easier. Wet soil is much softer than dry soil, making it easier to pull the entire weed up by the root. Also, since the soil is wet, the roots will let go of the soil and slide up with less resistance. Be careful when working on your wet garden, though, as wet soil is easier to compact, which can harm your plants.

They compete for nutrients and water, potentially stunting desired plants.

Mowing your grass regularly, especially if you’re mowing close to the ground, can help kill Johnsongrass. Frequent mowing helps limit the spread of Johnsongrass and can even deplete carbohydrate reserves in rhizomes over time. The more time you leave in between mowing, the more likely Johnsongrass is to regrow and take over your lawn.