A picture of a Penstemon 'Sour Grapes' M. Fish

Penstemon 'Sour Grapes' M. Fish

Penstemon 'Sour Grapes'

Buy Penstemon 'Sour Grapes' M. Fish
Partial Shade
Easy care
Light watering
Frost Hardy


RHS hardiness


Minimum temperature

Expected size








2 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

More images of Penstemon 'Sour Grapes' M. Fish

A photo of Penstemon 'Sour Grapes' M. Fish
A vase filled with purple flowers

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Penstemon 'Sour Grapes' 3lt Plant


Penstemon 'Sour Grapes' 3lt Plant


Penstemon 'Sour Grapes' M. Fish Overview

Penstemon 'Sour Grapes' is a hardy perennial that produces tall spikes of showy tubular or open trumpet-shaped purple-blue flowers with a white throat, throughout summer. It has large, glossy, deep green leaves. It likes a position in full sun or partial shade and fertile, well-drained soil. Suitable for many garden situations, it is usually seen in the mixed flower borders of cottage-style - and other informal - gardens. In colder areas, Penstemon 'Sour Grapes' will benefit from a dry mulch before the winter. Cut back old stems in spring. Keep well watered until new plants are established. 'Sour Grapes' was introduced in the 1950s by Margery Fish at East Lambrook Manor in Somerset. This cultivar has earned a Royal Horticultural Society (RHS) Award of Garden Merit. It is on the RHS 'Plants for Pollinators' list highlighting plants that produce large amounts of nectar and/or pollen. A great choice for encouraging beneficial insect wildlife into your garden! (The paler coloured cultivar 'Stapleford Gem' is very similar and is occasionally sold as Penstemon 'Sour Grapes').

Common problems with Penstemon 'Sour Grapes' M. Fish

Usually disease-free

How to harvest Penstemon 'Sour Grapes' M. Fish

Generally not harvested, stems can be cut for floral arrangements when required.

How to propagate Penstemon 'Sour Grapes' M. Fish


Semi-hardwood cuttings can be taken in mid to late summer.


Plants can be divided in spring.

Special features of Penstemon 'Sour Grapes' M. Fish

Attractive flowers

Attracts bees

Attracts butterflies

Attracts useful insects

Other uses of Penstemon 'Sour Grapes' M. Fish

Rock garden, cutting bed, border, flower arranging. Suitable for coastal conditions.