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Penstemon ‘Electric Blue’


Great for wildlife
May - October
45cm x 45cm
Partial Shade, Sun
Fully Hardy

Intensely blue flowers with a tinge of purple, contrast beautifully with the silvery green foliage of this hardy Penstemon. The long lasting blooms of ‘Electric Blue’ appear from June through to October enticing plenty of pollinating insects to your garden.  With a bushy, upright habit, this semi-evergreen perennial makes a superb addition to borders and wildlife gardens.

Additional information

Plant Type
Flowering Period
Flower Colour
Fully Grown Size
Garden Position
Light Level
Special Features
RHS Plants For Pollinators
RHS Garden Merit Award
Pot Size
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Penstemon 'Electric Blue' is a striking perennial that our nursery proudly offers for its vibrant, eye-catching blooms and robust nature. Known for its brilliant, electric blue flowers, this plant adds a dazzling pop of colour to any garden from late Spring until early Autumn. The tubular flowers, which are favourites among pollinators like bees, stand out against the lush green foliage, creating a stunning visual contrast. Our head grower selected Penstemon 'Electric Blue' for its exceptional garden performance and its easy care requirements. This variety thrives in full sun and well-drained soil, making it a versatile choice for various garden settings. Its drought-tolerant nature ensures it remains a reliable and resilient addition to your garden, even in drier conditions. Perfect for borders, rock gardens, and containers, 'Electric Blue' pairs beautifully with other sun-loving perennials such as Echinacea, Salvia, and Sedum. Its compact size, typically reaching about 45-60 cm in height, makes it suitable for smaller garden spaces as well. In addition to its stunning appearance, this Penstemon provides a valuable source of nectar for pollinators, contributing to the ecological health of your garden.

Planting Conditions

For optimal growth, plant Penstemon 'Electric Blue' in well-drained, sandy or loamy soil. We recommend avoiding heavier soils, as they can hinder root development. Choose a sunny location with good air circulation. To improve soil structure and drainage, you can amend the soil with grit or organic matter. Although moisture becomes less of an issue once the plant is fully established, it's essential to ensure that the planting site doesn't retain excessive water, especially during the establishment phase. This ensures vibrant blooms and healthy growth.

Watering & Feeding

Water Penstemon 'Electric Blue' regularly during its first growing season to establish a deep, extensive root system. Once established, reduce watering frequency, allowing the soil to dry out between sessions, as these plants prefer slightly dry conditions. Avoid overwatering, which can lead to root rot. We recommend feeding with a balanced, slow-release fertiliser in early Spring to encourage robust growth and vibrant blooms. Avoid high-nitrogen fertilisers, which can promote excessive foliage at the expense of flowers. Mulching can help retain soil moisture and reduce any weed competition.

General Care

We recommend pruning Penstemon 'Electric Blue' in early Spring to remove dead or damaged stems, promoting healthy growth. Regularly deadhead spent flowers to encourage continuous blooming throughout the season. This plant is generally pest-resistant, but occasional aphids or spider mites may appear; treat them with insecticidal soap if needed. Disease resistance is high, though proper spacing and good air circulation will help prevent issues like powdery mildew. Cutting back the plant by one-third after the first bloom can also stimulate a second flush of flowers.