Penstemon 'Sour Grapes' (True Sour Grapes)

Full Sun
Light/Partial Shade
Soil Type:
Most Types

See full plant description below.

Plant Details

A tall and vigorous border penstemon with flowers of soft purple for a long period in summer and autumn. Thought to have been introduced by Margery Fish.

This is the rare, correct 'Sour Grapes'. Many nurseries wrongly sell as 'Stapleford Gem' as Sour Grapes. This seems to be a mix up due to an honest mistake at a nursery several decades ago. We sell both because they are both wonderful Penstemons.

Sour Grapes has been given the RHS Award for Garden Merit.

Loved by bees.

Hardy in all but the harshest winters.

Height: 75cm

Penstemons really are fantastic plants for any border. They don't seem to suffer from any pest or disease and even the slugs avoid them. On top of that, they flower for months on end, right into autumn when many other plants have given up for the winter. They look equally at home in a traditional cottage garden bed, or a stylish modern design.

Penstemons can be divided into roughly two types. Border hybrids, which grow to between 60 and 80cm and are very colourful, and species Penstemons which are usually lower growing with smaller flowers. Nearly all originate from North America. Border hybrids tend to flower from June to October and species for a shorter period, earlier in the season.


All our plants are supplied in 9x10cm pots unless otherwise specified. Plants in this size pot establish quickly in the garden and often outpace plants in bigger pots planted at the same time. We do not sell 'plug plants' because those need to be grown on before planting. Our potted plants can be planted immediately, unless otherwise noted, or you can leave them in their pots until you are ready to plant. We grow everything we sell ourselves, in our nursery in the Buckinghamshire countryside.