Quackgrass (Elytrigia repens) was introduced as a forage crop. Unfortunately it is invasive and very hard to get rid of since it propagates by underground stems called rhizomes (pictured above), rhizomes can be several feet long! The rhizomes are capable of sprouting a new plant at each node. If the rhizome is cut into pieces (such as by disking) then each piece develops more plants.
One way to manage quackgrass is to harrow at the three leaf stage. If the soil moisture is right the harrow will pull out the rhizomes and they will dry out and die.
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