Broccoli gardeners are often encouraged to use spacing of 12" to 18" between plants within a row. However, commercial growers are encouraged to use much closer spacing. For example an online article NC University Broccoli Production Horticulture Information Leaflet contains: ". . . 2 rows per bed (9 to 12 inches apart) and 4 to 6 inches between plants in the row."
http://content.ces.ncsu.edu/broccoli-production
While the University of Clemson Organic Broccoli Cultivar Trial and Organic/Conventional Broccoli Plant Density Trial included trials at 4,6 and 8 inches apart within rows.
"Conventional vs Organic Cultivar Plant Density Trial Conclusions
Validated Higher Plant Populations Produce Greatest Yields With
Little Effect on Head Quality.
Increased Costs Associated with Higher Plant Populations Negate
Within Row Spacing Less Than 6”."
http://media.clemson.edu/public/rec/...ivar_trial.pdf
It would be great to hear from other Broccoli growers. Comments, Opinions, Experiences, Etc would be great.
Thanks,
Larry