Insectary crops are flowering plants that are planted in or near fields of agricultural crops to provide floral resources to natural enemies. Most insectary crops are planted to provide nectar and pollen to parasitic wasps and adult syrphid flies. Insectary crops are interplanted with organically-grown lettuce on California’s Central Coast by growers who hope to enhance biological control of aphid pests by syrphid flies. We grew 17 varieties of commercially available insectary plant and four experimental insectaries (culinary herbs) at two sites in Salinas, California during the 2006 growing season. We collected data on the duration and percentage of flowering, and made timed observations on the number and species of syrphid fly adults visiting these cultivars. The most attractive insectary crops in our trial included sweet alyssum (Lobularia maritima), common coriander, and dhani-ya coriander.