Questions and Answers for Using Sunn Hemp (Crotalaria juncea L.) as a Green Manure Cover Crop

Sunn hemp flowering during the summer growing season in southern Florida.

This 4-page document synthesizes information about the warm-season cover crop, sunn hemp. It addresses frequently asked questions for growers and summarizes the expanding body of sunn hemp research. The information is provided so growers in Florida can learn about up-to-date cultivation and management options as well as better understand sunn hemp’s practical uses. Written by Thioro Fall, Ariel Freidenreich, Stacy Swartz, Christopher Vincent, Yuncong Li, and Zachary Brym, and published by the UF/IFAS Agronomy Department, July 2020.

SL306/TR003 Sunn Hemp – A Cover Crop in Florida

Revised! SL-306 (formerly SS-AGR-96), a 4-page illustrated fact sheet by Yuncong Li, Qingren Wang, Waldemar Klassen, Edward A. Hanlon, Jr., describes this green manure crop that has been grown for centuries in Southeast Asia — origin and distribution, description, uses, production and harvest, and seed production. Includes references. Published by the UF Department of Soil and Water Sciences, August 2009.