Cyclamen is a semi-alpine flowering plant that is native to the mountains of Turkey. Because of its mountainous, cool-weather origins, cyclamen is great for greenhouse growing during the winter months, the flowers blooming from November until March or April. Cyclamen blooms come in shades of red, pink, purple and white, as well as bi-colored and striped. The trick to growing cyclamen plants in a greenhouse is to maintain the specific humidity levels and air temperatures.
Fill an 8- to 10-inch-diameter planter pot that has drainage holes in the bottom with all-purpose potting soil mixed with some humus (leaf mold).
Plant the cyclamen into the potting soil so that the top of the tuber is just slightly above the soil surface. If you're planting more than one cyclamen in the same container, space them about 6 inches apart.
Position your cyclamen in a spot in your greenhouse that has good air circulation and indirect light. Maintain air temperatures in your greenhouse below 65 degrees F during the day and below 50 degrees at night.
Water your cyclamen evenly each day with room-temperature water during its growing season to keep the soil evenly moist. Mist the plant daily to increase the humidity around the cyclamen.
Feed your cyclamen plants once each month during its active winter season with a liquid all-purpose houseplant fertilizer at half the normal dosage rate.
Remove the dead leaves and flower stalks in the spring, and gradually stop watering to prepare the cyclamen for the dormant period. Move the cyclamen to a shaded, cool area until late summer.