Petunia is a highly popular and versatile flowering plant, widely grown as an annual in the UK, and cherished for its trumpet-shaped flowers and extended blooming season. These plants vary greatly in size and habit, from compact and bushy to trailing, and their vibrant blooms come in a vast array of colours including white, pink, red, purple, yellow, and even black, often with intricate patterns or contrasting veins. Their continuous display of cheerful flowers makes them a favourite for bedding, borders, hanging baskets, and containers, brightening gardens across the UK. They are members of the Solanaceae family.
The genus name Petunia is derived from the Tupi-Guarani word petun, meaning "tobacco," as the plants are related.
Light: Petunia thrives in full sun. It requires at least six hours of direct sunlight daily for the most abundant flowering. In the UK, a sunny spot in a garden or on a balcony is ideal.
Water: Water regularly, especially during dry periods and when grown in containers. Keep the soil consistently moist but not waterlogged. Allow the top inch or two of soil to dry out slightly between waterings. Ensure good drainage, particularly in the often damp conditions of the UK.
Soil: Petunia prefers well-drained soil. A general-purpose potting mix is suitable for containers, and in borders, garden soil amended with organic matter can improve fertility and drainage.
Fertilising: Feed regularly throughout the blooming season (spring to autumn) with a balanced liquid fertiliser to encourage continuous flowering. A fertiliser high in phosphorus can be particularly beneficial for flower production.
Temperature: Petunia prefers warm temperatures and is not frost-hardy. In the UK, they are typically grown as annuals, planted out after the last risk of frost in late spring.
Humidity: Average UK humidity levels are generally sufficient for Petunias. Good air circulation is beneficial, especially for denser varieties, to help prevent fungal issues.
Growth Habit: Varies greatly by cultivar, ranging from upright and mounding to vigorous trailing types, making them suitable for diverse planting schemes.
Toxicity: Petunias are generally considered non-toxic to humans. However, some sources suggest they can cause mild irritation if ingested by pets. It's always best to prevent ingestion by curious animals and young children.