Anaerobic digestion Chilworth Construction Management Plante medicinale Brassica: Domestication, Weeds, and Evolution New York Botanical Garden SLA Architects' ski park atop BIG power plant to open this year Detour Pit Stop #16 ~ Touring the Bentley factory Detour Plant your poppies when it's cold! Poppy seeds require a period of cold to germinate and grow, so they generally do best when planted in the late fall or early spring.