Agapanthus Bertsbrook is a hardy, deciduous variety with elegant deep blue flowers that rise on slender stems above clumps of strap-like green foliage. Flowering in mid to late summer, it provides vibrant colour and height to borders and garden beds. This reliable cultivar is known for its graceful appearance and long-lasting flowers.
Ideal for cottage, coastal, or informal gardens, it thrives in full sun and prefers well-drained soil. It is drought-tolerant once established and can also be used effectively in container planting. Space plants 30–40 cm apart to allow for its natural spreading habit.
Mature size: Reaches up to 70–80 cm in height and 40–60 cm in width, forming an upright, clumping shape.
Trimming: Trim back spent flower stalks and remove any dead or yellowing leaves to maintain a tidy appearance.
Deadheading: Regularly deadhead faded flowers to encourage continuous flowering and prevent self-seeding.
Fertilising: Feed with a balanced fertiliser in spring and summer to promote healthy growth and flowering. Avoid high-nitrogen fertilisers which can result in excessive foliage growth.
Watering: Water thoroughly during the establishment phase and ensure the soil remains moist but well-drained. During dry periods, water deeply once a week.
Pest Control: Watch for snails and slugs, especially in the early spring. Use organic slug pellets or barriers to protect young plants.
Disease Management: Agapanthus is generally disease-resistant but can be affected by root rot if overwatered. Ensure proper drainage to prevent this issue. If leaves show signs of yellowing with brown spots, this may indicate fungal infections; treat with a fungicide as necessary.
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