Frequently asked questions about couch grass
1. What is couch grass and how do I recognize it?
Couch grass (Elymus repens) is a hardy perennial grass characterized by long, narrow leaves and deep-growing rhizomes (rootstocks). It commonly grows in lawns, vegetable patches, and unused garden areas. Its distinctive features are its long, stiff leaves and typically grass-like flower spikes.
2. Why is couch grass so problematic in the garden?
Couch grass is particularly difficult to control because it reproduces primarily through its underground rhizomes. These rhizomes can spread widely and produce new plants, even if only small pieces of the rootstock remain. This can cause couch grass to crowd out other plants and compromise the growing conditions in your garden.
3. Is couch grass edible or useful?
Although couch grass is not a common crop, it was once used in some cultures. Its roots contain starch, which could serve as a food source in times of need. Today, however, couch grass is mostly considered a weed that poses a management challenge in gardens.
4. How can I effectively combat couch grass?
Combating couch grass requires patience and a targeted strategy: rhizomes should be removed from the soil and dried in the sun to prevent their ability to regenerate; hoeing the plant should be avoided, as the root remains would otherwise promote spread; dense planting, for example with peas or tall dahlias, helps to suppress the couch grass by depriving it of light; and a thick layer of mulch prevents the germination of new plants.
5. How long will it take for the couch grass to completely disappear from my garden?
Complete removal of couch grass can take several months to years, depending on the extent of spread and the control measures used. Continuous attention and regular weeding or digging up of the rhizomes are required to eliminate the plant in the long term.
6. Can I also use couch grass in compost?
No, couch grass should not be added to compost, as the rhizomes and root fragments can survive and re-spread. It's better to dry the removed parts of the plant in the sun before disposing of them or composting them.
