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Do Geranium Plants Need Light?

Zonal geraniums (Pelargonium spp.) are favorite summer annuals, appreciated for their bright blooms and repeat flowering. If given their basic cultural requirements, geraniums will reward the gardener all season long. Chief among its needs is bright sunlight.
  1. Culture

    • Geraniums require moist, well-drained soil, rich in organic matter. They are heavy feeders and need regular fertilization. They need to be watered in the absence of rainfall. Full sun -- 6 to 8 hours a day -- will help them grow their best.

    Benefits

    • Geraniums photosynthesize sunlight into plant sugars for energy. Because they are fast growers and prolific bloomers, they use a lot of energy. The slightly pubescent texture of geranium leaves also necessitates prolonged sun exposure.

    Indoors

    • If planted indoors, geraniums should be given as much sunlight as possible. A sunny window is best. Grow lights can supplement light, if needed. On a porch or shady patio, choose the brightest spot.