For cover cropping or green manure applications, the most frequently used other forb species are Brassica species, including canola (rapeseed), kale, and raddish. In mild environments, forbs can be sown in fall or spring. In cold-winter regions, forbs are planted in the spring after danger of hard freeze.

Canola (Rapeseed)
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(See http://www.sarep.ucdavis.edu/cgi-bin/ccrop.EXE/show_crop_11)

Kale
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(See http://www.sarep.ucdavis.edu/cgi-bin/ccrop.EXE/show_crop_27)

Raddish
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(See http://www.sarep.ucdavis.edu/cgi-bin/ccrop.EXE/show_crop_27)