How Long Do Weed Plants Live
CORVALLIS - Weed seeds tin survive in the soil for years before they germinate and abound, according to Jed Colquhoun, weed specialist with the Oregon State University Extension Service.
Why should home gardeners care?
"If you combine the longevity of seeds in the soil with the fact that weeds such as common lambsquarters tin produce over 500,000 seeds per plant, the incentive to hand weed your garden becomes much greater," said Colquhoun.
"Prevention is the most effective form of weed command," he said.
Hither are some basics on weed seed biology:
Undisturbed weed seeds tend to persist longer than seeds subjected to periodic tillage. Weed seeds in deeply worked soil tend to concluding longer than seeds in shallowly worked soil. Seeds deep in the soil are "stored" below the formation zone.
Grass seeds tend to exist less persistent than broadleaf weed seeds.
The number of surviving seeds of most weed species declines apace the first year. But thereafter the charge per unit of weed seed decline slows. Some seeds tin persist for decades.
As many as 130 million seeds per plow acre were establish in a Minnesota report.
Different species of weeds accept seeds that last varying numbers of years in the soil. The scientific literature provides some information virtually seed longevity, including:
- Brome grass seed seldom lasts more than two years.
- Annual ryegrass - up to nine years.
- Perennial ryegrass - up to three years.
- Annual bluegrass - up to almost v years.
- Wild oats - three to six years, only longer in deep soil.
- Jointed goatgrass - iii to five-and-a-half years.
- Barnyardgrass - up to xiii years.
- Quackgrass - upward to iv years.
- Common velvetgrass - 10 years or more than.
- Mustards - are long lived. Seeds excavated from a monastery in Denmark were dated to be 600 years old and xi of them germinated. More commonly, mustard seeds last for decades.
- Lambsquarters - may final up to iv decades.
- Russian thistle (tumbleweed) - short lived, most live just a year.
- Wild carrot - several years.
- Curly dock - more than a decade.
- Canada thistle - more than 2 decades.
- Field bindweed - more than l years.
- Leafy spurge - at least a few years.
- Common groundsel - near die within a year.
Scientists establish lotus seeds in Manchuria that germinated later over 1,000 years, said Colquhoun.
Desire to acquire more about this topic? Explore more than resource from OSU Extension: Weeds
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Source: https://extension.oregonstate.edu/news/how-long-do-weed-seeds-survive-soil
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