Bleach is an effective herbicide. The best time to cut back pampas grass is in late winter. Pampas grass (Cortaderia selloana) grows tall in clumps, offering attractive, fluffy tips near the end of summer in … Mist onto all exposed surfaces of the pampas grass, applying according to the guidelines on the herbicide's label as toxicity varies widely by product. These won’t be as quick, easy or necessarily 100% effective but they have worked for someone in the past. You are looking for post-emergent herbicide rather than pre-emergent. You can multiply this ratio if you are doing a large area or divide it for a smaller spot or even you pure bleach if you want to. It won't work against larger or invasive weeds like Ivy, Brambles or Knotweed. While you can kill pampas grass with any of the above-written methods, it is essential to take care of yourself and use all kinds of precautions mentioned above. Wear protective clothing, face mask and goggles. thanks for the post! We inherited the pampas grass from previous owners (not sure if they were swinger or not ).I'm in the process of chopping it down but have so far had the next door neighbour and the postman tell me that it's a bugger to get rid of, so all help appreciated. For most soil conditions, only about 1 cup of bleach is necessary to kill grass over a 6-by-6 inch square area. This video shows how roundup can be applied – your job will be easier since the plant you are dealing with wil be cut back. Be sure to follow the dilution instructions on the product label and always wear gloves when working with chemicals. Be careful with this method though, the guys holding the pry bar can get flung around if … Will Roundup Kill Pampas Grass?. I have a customer who has an out of control 15ft.+ circle of pampas grass she'd like removed. One gardener said he required 5 pounds of ice-cream making salt to take care of a medium plant. If yes, what ratio bleach… In the case of getting rid of pampas grass, herbicide is really the best way to effectively kill the clumps. Pampas grass is a popular landscape plant that is commonly seen in the home garden. It won't work against larger or invasive weeds like Ivy, Brambles or Knotweed. Pampas grass (Cortaderia selloana) is a majestic large tussock grass from, as the name suggests, the pampas (grasslands) of South America.It’s quite a whopper: about 6 to 15 feet (2 to 4.5 m) in height and 3 to 8 feet (1 to 2.5 m) in diameter. Save my name, email, and website in this browser for the next time I comment. Novice gardeners often overwater for fear that they aren't watering their plants enough. While this might be good at keeping grass from growing back into the cracks of the sidewalk for a longer amount of time, it is not so good if you are spraying the weeds to kill them so you can plant something else in that spot. I would normally kill it out with chemicals and till. Dig out grasses with a spade or cut large grassy areas into strips with a sod cutter, which you can often rent at a rental supply store. Also, try to avoid days when it might rain as the rain will dilute, as well as potentially spread, the bleach and make it not work. Title says it all really. On a similar note, neglecting to water plants, especially indoor plants that don't benefit from natural precipitation, will also lead to their demise. While you can use bleach straight from the bottle to kill grass and weeds, if you use too much, there is a high possibility that the bleach will leach into the surrounding soil beyond where you sprayed it and kill the plants nearby as well as the ones you sprayed. It can easily go invasive due to the 100,000 seeds they produce per flower head; now you’re battling with a monster on the loose. Allison Cartwright has been writing professionally since 2009. These methods would help you kill the self-growing menace, i.e., pampas grass. 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