Penstemon ‘Catherine de la Mare’
Penstemon heterophyllusA feature in St Erth’s new perennial border with fascinating iridescent blue blooms. Makes a wonderful cut flower.
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Penstemon ‘Catherine de la Mare’
Position: Plant in full sun for best flowering, though it will tolerate light shade. Prefers well-drained soil enriched with organic matter. Avoid heavy, waterlogged soils.
Planting: Space plants 40–50cm apart to allow good air circulation. Water in well after planting. Mulch around the base to retain moisture and suppress weeds.
Watering: Once established, Penstemon is drought-tolerant, requiring only occasional deep watering in dry periods. Water young plants regularly until roots are well-developed.
Fertilising: Feed in early spring with a balanced organic fertiliser or compost to promote strong growth and abundant flowering. Avoid excessive nitrogen, which encourages leafy growth over blooms.
Pruning & Maintenance: Deadhead spent flowers regularly to encourage continuous blooming. In late winter or early spring, trim the plant back by one-third to promote fresh new growth and maintain a compact shape. Remove any weak or woody stems to improve airflow and reduce the risk of disease.
Generally pest-resistant, but watch for aphids in spring. Avoid overhead watering to prevent fungal issues, especially in humid conditions. Perfect for cottage gardens, borders, and mixed plantings, Penstemon 'Catherine de la Mare' is a tough, reliable performer that brings effortless charm to any garden.