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Penstemon Dark Towers

Dark Towers is a highly sought-after unusual Penstemon displaying unique dark bronze, semi-evergreen foliage. In early summer on tall stately spires, a profusion of long-lasting delicate blooms appear and will last into September in favourable weather conditions.

From round, tight buds full of promise and optimism, tubular flowers with a dark pink throats and white tips smother the hardy perennial creating an unbeatable floral spectacle.

It tolerates almost any position in the garden but looks fabulous in informal borders or a pot of other perennial plants. They hold well in the vase, so why not add them to a cut flower bouquet for some different texture and colour?

Flower Colour

Type of garden
Container Gardening, Cottage Garden, Small Gardens

Bees and Butterflies, Drought Tolerant, Foliage/Stem/Fruit Interest, Ideal for Beginners, Suitable for Container

Hardy Perennial


14 day

Flowering Time
Long Flowering, Summer & Autumn

Sun or Partial Shade

45-60cm (18-24")

Online Only

75cm (30")



Unfussy on soil conditions as long as it well-drained.


Full sun or partial shade




June to November often longer

Additional Information

Overwatering young plants can be detrimental. Let the compost dry out before re-watering and give plenty of ventilation. Once established, dead-head regularly to encourage further flowering. Slug and rabbit resistant. Cut back in late spring, not autumn, to 25cm to encourage basal growth. Propagate by taking cuttings from non flowering shoots in summer.***Please note that for Penstemon Dark Towers that unlicensed propagation is prohibited. ******* Hardy perennial.

Delivery Date: 15 Sep 2017 (+/- 14days)
Plant Hardiness

How hardy are our plants?

All our plants have a guideline temperature for how well they will tolerate winter cold.

Fully hardy perennials will withstand temperatures down to -15 °C (5°F) and often lower.
Hardy perennials are happy down to at least -5°C (23°F)
Half hardy perennials can withstand down to around 0°C (32°F)
And Tender perennials may be damaged by temperatures below 5°C (41°F)

Please remember that temperatures can vary significantly within quite a small area, and hardiness can be affected by soil, position and other factors.
If in doubt please give us a call.

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"Thank you ladies for your beautiful plants.
Praise also, for the Bulrush Compost, of which I have purchased 8 bags during the past six months. It is superb and my garden has flourished.
Bless you,
Kind wishes"
Janet Morgan
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