Spirogyra: Features, Occurrence, Structure, Reproduction Wineberry Natick, MA Official Website USDA Zone Map: The Southern Guide To Plant Hardiness And Climate Zones 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 Freesia Bulbs Fragrant Cut Flower Bulbs This is called water culture, or hydroponic orchid growing. Give the plant bright light and change the water every week. Add liquid orchid fertilizer to the water while its not flowering. #orchids