Scented-leaved geraniums usually have smaller blooms.
Although researchers have not proven the citronella geranium provides protection from mosquitoes, many gardeners hold this opinion. This cultivar of geranium is a hybrid created by scientists. They implanted a code into the genes of a geranium, which causes it to produce citronella oil. The pungent smell of citronella occurs when someone crushes or rubs the leaves. Many believe the citronella fragrance repels mosquitoes. Gardeners can propagate the citronella geranium by cuttings or seeds. Does this Spark an idea?
Gathering Seeds
Gardeners can gather citronella geranium seeds by trimming off stems with blossoms and placing them in a paper bag. Leftover nutrients and moisture in the stems will nourish the seeds while they ripen. Leave the bag open to allow for air circulation. Do not place too many stems in one bag, as overcrowding will lead to mold production. Once the pods are ripe, the seeds will spill out into the bag. Give each stem a shake to ensure all seeds have fallen out. After the seeds are ripe and thoroughly dry, place them in a paper envelope. Do not store them in plastic as moisture can develop and rot the seeds.
Planting Seeds
Gardeners who choose to grow the citronella geranium from seed will meet a challenge. The seed has a hard shell, which makes germination difficult. Horticulturists with North Carolina State University recommend scoring the surface of the seed to break the shell, which will help with water penetration. Plan to start the seeds indoors three months before the latest predicted frost date. Place the scored seeds in soil, loosely cover and keep at 72 degrees F. If planting in a flat container, space seeds ¼ inch apart, and allow 1 to 2 inches between each row. A suggested covering is clear plastic wrap, which will increase humidity for germination. Lightly mist the seeds with water to keep evenly moist without soaking. Vent the plastic cover if seeds are sitting in direct sun to avoid excessive humidity.
Caring for Seedlings
Germination normally occurs seven to 14 days after planting seeds. After seedlings emerge, remove the plastic covering and allow for ventilation. Continue misting seedlings and do not allow them to dry out. Remove individual seedling plants and transplant to single small 4-inch pots. Keep the budding geraniums at 72 degrees F during the day and 65 degrees F at night. The new plants need 14 to 18 hours of light each day. It may be necessary to supply extra light by using fluorescent tubes above the seedlings. Two weeks after transplanting, start feeding the geraniums with water-soluble plant food every two weeks until they are outside. Gardeners should allow 95 to 100 days until the plants bloom.
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