Horizon White Geranium

Horizon White is a seed-grown zonal pelargonium with large clusters of pure white flowers above its foliage through summer. Its compact, branching habit suits container displays, window boxes, and the front of a seasonal border. ## Seasonal Display This named White selection belongs to the Horizon F1 series of Pelargonium × hortorum. Sources describe a summer display and give a range of mature sizes, so plan for roughly 10–16 inches tall and 15–18 inches wide; light and growing conditions can affect the finished plant. A [Horizon seed supplier](https://www.wholesale.molesseeds.co.uk/annuals/d-g/geranium/f1-horizon-series/geranium-f1-horizon-white-ger160) identifies the White selection and describes the series’ branching habit. [Marshalls Garden](https://marshallsgarden.com/products/geranium-horizon-white-30211047) confirms the pure white flowers, summer bloom, full-sun position, and 40 cm eventual height, while [Garden Center Marketing](https://www.gardencentermarketing.com/plantname/Pelargonium-x-hortorum-Horizon-White) lists its spread and zonal geranium identity. ## Placement and Growing Grow it in full sun and a well-drained loam-based mix. It is suitable for pots, window boxes, and borders. Pelargoniums prefer free-draining compost and moderate watering during active growth; let excess water drain away rather than keeping the root zone wet. In frost-prone areas, grow it as a warm-season annual or protect it from winter cold. The [RHS guide](https://www.rhs.org.uk/plants/pelargonium/growing-guide) provides general pelargonium growing advice. ## Maintenance Deadhead spent flower clusters regularly to prolong the display into early autumn. Keep containers draining freely and remove faded stems as the season ends.