Penstemon Plants: Your Complete Guide to Growing These Colourful Perennials

Introduction

Penstemons are a gardener’s favourite for adding vibrant colour and long-lasting blooms to borders and containers. Known for their tubular flowers and ability to attract pollinators, these versatile plants are easy to grow with the right care. In this guide, we’ll answer the most common questions:

• Do Penstemons come back every year?
• Do Penstemons like sun or shade?
• Where do Penstemons grow best?
• Are Penstemons hardy in the UK?

Do Penstemons Come Back Every Year?

Yes—Penstemons are perennial plants, meaning they can return year after year. However, their longevity depends on:

• Variety: Some are short-lived perennials, lasting 3–5 years.
• Care: Regular deadheading and pruning encourage healthy regrowth.
• Winter Protection: In colder regions, mulch around the base to protect roots.

Do Penstemons Like Sun or Shade?

Penstemons thrive in full sun. They need at least 6 hours of direct sunlight daily for strong stems and abundant flowers. While they tolerate light shade, too much shade can lead to weak growth and fewer blooms.

Where Do Penstemons Grow Best?

• Soil: Well-drained soil is essential. They dislike waterlogged conditions.
• Position: Sunny borders, rock gardens, and containers.
• Climate: Mild, frost-free areas are ideal, but hardy varieties cope well with UK conditions.

Are Penstemons Hardy in the UK?

Most Penstemons are hardy in the UK, especially varieties like Penstemon ‘Raven’ and Penstemon ‘Garnet’. However:

• In colder regions, apply a thick mulch in autumn.
• Avoid cutting back too hard before winter—leave stems for frost protection.

How to Care for Penstemons

1. Planting: Spring or early summer is best.
2. Watering: Moderate—avoid soggy soil.
3. Pruning: Light trim after flowering; hard prune in spring.
4. Feeding: Use a balanced fertiliser during the growing season.

Why Grow Penstemons?

• Long Flowering Season: June to October.
• Pollinator Friendly: Bees and butterflies love them.
• Low Maintenance: Perfect for busy gardeners.

Popular Penstemon Varieties

• Penstemon ‘Raven’ – Deep purple blooms.
• Penstemon ‘Garnet’ – Rich red flowers.
• Penstemon ‘Apple Blossom’ – Soft pink tones.