Growth Rate
Moderate: Lavandula 'Phenomenal' has a moderate growth rate, typically growing about 1 to 2 feet per year under optimal conditions.
Size
Mature Height: Reaches a height of 2 to 3 feet.
Mature Spread: Spreads about 2 to 3 feet wide, forming a neat, rounded shape.
Growing Conditions
Sunlight: Prefers full sun.
Soil: Thrives in well-drained, slightly alkaline soil. It is tolerant of poor soil conditions but requires good drainage to prevent root rot.
Watering: Drought-tolerant once established, but regular watering is necessary during the first growing season to establish a strong root system. Afterward, occasional deep watering is sufficient.
Hardiness Zones: Suitable for USDA hardiness zones 5-9.
Maintenance: Requires minimal maintenance. Pruning after flowering helps maintain its shape and encourages new growth.