flower bed over grown with crabgrass

Asked May 24, 2017, 8:20 PM EDT

Help! I have several flowerbed which are being consumed by crabgrass. I have tried everything short of digging up the whole bed or killing off all vegetation and re-planting Any suggestions you have on how to get the crabgrass under control with out killing off the rest of the plants would be greatly appreciated.

Douglas County Colorado

3 Responses

We need to ensure it is really crabgrass rather than quack grass or another invasive weedy grass before we recommend control measures. A sample of the problem grass brought in to the Douglas County extension office or a photo would be recommended. Email photo to dcmgardenr@gmail.com

I have attached several photos including one area of the bed, an uprooted plans and also a closeup of a stalk that is starting to seed. Thanks for your help.

Your pictures do not look like crabgrass or goosegrass - both of which are annuals that are easily pulled out manually. (Their flower heads usually branch into 3 or five spikes, not a single stalk as in your picture.) Here is a link to a fact sheet with information about controlling annual weeds (in lawns). Note that the chemical treatments may harm your garden plants.
http://extension.colostate.edu/topic-areas/yard-garden/control-of-annual-grassy-weeds-in-lawns-3-101...

The photo looks more like quackgrass, which is an aggressive perennial grass that spreads by underground runners, and is very hard to control. Here is a link to an article with some suggested control methods.
https://www.extension.umn.edu/garden/yard-garden/weeds/controlling-quackgrass-in-gardens/

Best of luck controlling the weeds!