Geraniums provide vibrant color as houseplants as long as they have proper growing conditions. Healthy geraniums have multiple branches and a full, bushy look. Spindly geraniums lack branches, have a weak green color and develop few leaves.
- Geraniums become spindly when they get insufficient light and when conditions are too warm and dry. They prefer bright sunlight for most of the day and temperatures of 65 degrees Fahrenheit during the day and 55 degrees at night.
- Encourage branching of spindly geraniums by pinching off the tips of shoots to spur bushy growth. Keep geraniums in a south-facing window and use supplemental light 12 to 16 hours a day if you do not have enough natural light.
- Ron Smith, a horticulturist at North Dakota State Extension, recommends trimming the geraniums to 3 to 4 inches to revitalize spindly plants. Then brush the soil from the roots, dust them in sulphur, and store them in a cool, dark place over the winter. In February, bring them out and keep them in a sunny window.