The Brassica Family: One Plant, Many Vegetables

grown naturally along the rocky coastlines of Europe for thousands of years. Through careful human selection, it has gradually developed into many of the vegetables that are commonly found in supermarkets today. The transformation of Brassica oleracea did not happen by chance. It was the result of a process known as selective breeding, in which farmers repeatedly chose plants with desirable characteristics and used them to produce the next generation. Unlike modern genetic engineering, selective breeding does not involve changing a plant's DNA in a laboratory. Instead, it relies on naturally occurring genetic variation that already exists within a species. Early farmers noticed that some wild Brassica plants had larger leaves, thicker stems or more compact flower buds than others. By saving seeds only from these preferred plants, they gradually increased the frequency of these characteristics over many generations. As a result, different vegetables began to emerge. Cabbage was developed for its large terminal leaves, broccoli for its flower buds, cauliflower for its undeveloped flower clusters, Brussels sprouts for its side buds, kale for its loose leaves and kohlrabi for its swollen stem.