About
Buddleja davidii 'Castle Blue' is a deciduous shrub that can reach heights of 2 meters. It features slender, lanceolate leaves that are light green and can grow as long as 18 centimeters. In summer, it produces elongated panicles of fragrant flowers, measuring up to 25 centimeters in length and 10 centimeters in width, with a subtle pinkish-lilac hue.
About the genus
Buddleja comprises evergreen and deciduous shrubs, and in some cases, it can also be found as small trees or scrambling climbers. The foliage consists of simple leaves, and the plants produce clusters of small, tubular flowers that emit a pleasant fragrance.
Growing conditions
- Sunlight
- Full sun
- Soil type
- Sand, Chalk, Loam, Clay
- Soil pH
- Neutral, Alkaline, Acid
- Soil moisture
- Moist but well-drained, Well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H6
Plant details
- Plant type
- Shrubs
- Habit
- Bushy
- Foliage
- Deciduous
- Height
- 1.5-2.5 metres
- Spread
- 1.5-2.5 metres
- Time to full height
- 5-10 years
- Suggested uses
- Wildlife gardens, Cottage and informal garden, City and courtyard gardens, Coastal
- Fragrance
- Flower
Care notes
- Cultivation
- Grow in well-drained soil in full sun. See buddleja cultivation for more detailed advice
- Pruning
- Pruning group 6
- Propagation
- Propagate by hardwood cuttings in autumn, or by heeled semi-hardwood cuttings in summer
- Pest resistance
- May be susceptible to aphids, capsid bugs, caterpillars, earwigs, figwort weevils, glasshouse red spider mite, leaf and bud eelworm, and mullein moth
- Disease resistance
- May be susceptible to honey fungus, fungal leaf spot, and virus diseases