The nubs on the broccoli are actually tightly clustered flower buds. Harvest the head after the flower buds begin to swell, but before they actually open.
PHOTO: DAVID CAVAGNARO
This swirly romanesco looks like something plucked on another planet.
This beautiful specimen is 'Violet Queen.' The purple color changes to green or blue when cooked.
WILLIAM D. ADAMS
Chart: How to beat broccoli pests.
MOTHER EARTH NEWS STAFF