Ivy-leaved geraniums (Pelargium peltatum) have waxy leaves that grow in a trailing habit suitable for window boxes and hanging baskets. While their flower heads are less dense than those of the more upright common zonal geraniums (Pelargium X hortorum), the blossoms are longer lasting. New cultivars come in dramatic shades, including the Atlantic series, which offers sea-blue and deep-red burgundy flowers. These plants are easy-care and drought-resistant, requiring only cooler night temperatures and occasional fertilizing.
Mix 1 gallon of potting medium with 2 tbsp. of powdered kelp fertilizer. Moisten the mixture with rain water and fill an 8-inch pot half way with the damp mixture.
Place an Atlantic dark-red ivy geranium in the pot, trimming the roots with pruners as necessary to fit in the pot. Fill the remainder of the pot to within 1 inch of the rim with potting mixture.
Water the plant with rain water and place it in a sunny location. Water regularly, but allow the soil to dry out between waterings.
Once a month, include a diluted solution of fish emulsion fertilizer in the watering.
Monitor the temperature around the Atlantic dark-red geranium. If nighttime temperatures do not drop below 70 degrees Fahrenheit, move the plant to a cooler location during the night and return it to its sunny spot during daylight hours.
Promptly remove dead blossoms to encourage additional flowering.