Zinnia 'Benary's Giant Mix' seeds 6ft to 9ft BIG plants for local delivery Dahing local plant delivery Dahing Plants Ferula communis The Giant Fennel () #AmorgosBotanicalPark Ferula communis is one of the most striking plants in the Mediterranean landscape. With its towering stalks and bright yellow umbels, it I think most of us recognize that plants need carbon dioxide to perform photosynthesis. You may have learned that plants and animals work together: plants take in carbon dioxide and produce oxygen