[Market-farming] Re: does rapeseed winterkill?

Steve Diver steved at ncat.org
Tue Jul 20 18:28:34 EDT 2004

Rapeseed comes in both spring and winter varieties.

"Brassica campestris is primarily a spring annual, and B. napus a
winter annual, (although both have winter and spring varieties)."

In Oklahoma, Zone 7, we grew some rapeseed from Johnny's Selected
Seeds as a fall-planted winter annual just like winter wheat .  It flowered
the next spring (and turned the field bright yellow) followed by ripening
in June.  

If you're looking for a winter-killed cover crop that provides a lot
of biomass, in addition to sorghum-sudan you can look at
Japanese millet.  If you are looking for the brassica effect (as an
alternative to winter-hardy rapeseed) you can look at oilseed radish
(Raphanus sativus) which grows in cool weather but winter kills and
leaves a decent crop residue.  


Oregon Cover Crops:  Rapeseed

Cover Crops for Ontario: Oilseed Radish

Oilseed Radish (Michigan)

Summer Cover Crops: North Carolina

Steve Diver

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