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Penstemon 'Sour Grapes'

 In Stock
Pot size
£17.99 Save 10%
Description Reviews FAQ Questions
I feel sentimental about this plant which was given me, under this name by Vita Sackville-West. I am told that it should be called ‘Stapleford Gem’. Having sent out possibly thousands as ‘Sour Grapes’ I am reluctant to change and confuse many gardeners. P. ‘Sour Grapes’ (P. ‘Stapleford Gem’) is a beautiful plant, hardy on well-drained soil. The flowers are like unripe grapes or opals, soft green, amethyst and blue, opening from July till October. 61 cm.
AspectSun or part shade
Flower ColourGreen | Blue | Purple
Flowering PeriodJul | Aug | Sep
FoliageNot evergreen
Growth HabitClump-forming
HardinessFully hardy
SoilRich and fertile

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  • Can I order something that you don't sell?

    We stock over 2000 varieties of plant and not all of them make it onto our website. If there is a specific variety or plant you are after, please email us on

  • Availability

    Stock levels are kept fully updated on our website.  If you plan to visit our Nursery please do check our website for current availability before travelling.  Alternatively please email us on and we will be happy to help. 

  • What size pots will my plants be supplied in?

    We sell our plants in three different sized pots dependent upon their growth needs:

    • 9cm – for all our alpine plants
    • 1 litre –  for the majority of our herbaceous perennials
    • 2 litre – for shrubs and those herbaceous perennials which require a larger root run
  • Where do you deliver?

    We are pleased to be able to deliver our plants throughout the UK and Ireland.  Unfortunately, we are currently unable to deliver overseas.

  • How much does delivery cost?

    Rather than absorb the cost of postage within our plant price we prefer to charge a realistic postage and packing charge.


    For orders dispatched to England, Wales and Scottish Lowlands the charge for delivery is:

    • £9.95 for orders up to £200
    • £15.00 for orders from £200 to £500
    • £20.00 for all orders over £500


    Please see our Delivery & Returns Page for more information - and charges for Scottish Highlands & Islands, Northern Ireland, Irish Republic and the Channel Isles.

  • When will I receive my order?

    Once you’ve placed your order online you will receive a confirmation email.  Your order will then be dealt with as quickly as possible by our experienced mail order team. During peak periods it can take up to 10 working days to receive your plants.  Once the team have selected your plants the status of your order will change to “processing”.  Finally - when your order has been carefully prepared and boxed and is ready to be collected by our courier - you will receive a dispatch email and can expect your plants to arrive the following day (for England, Wales & Scottish Lowlands).  We use a special fragile overnight delivery service to ensure that your plants spend the minimum amount of time in transit. Please see our Delivery & Returns Page for more information - and for delivery times to Scottish Highlands & Islands, Northern Ireland, Irish Republic and the Channel Isles.

  • How do I track my delivery?

    Once you receive your dispatch email click on the tracking number link and you will be redirected to our couriers APC. Enter your tracking number and postcode there and you will be able to track the progess of your parcel(s).


  • Why has my plant been cut back?

    Traditionally the mail order plant season has run from October to March. This was because many plants would dormant during this time of the year and foliage would either be reduced or absent, making them easier to post.

    Now mail order runs all year round and thus requires us to maybe cut back some of your plants, particularly from April to October. Plants with tall flowering stems and lots of foliage may lose a great deal of water in transit and cutting back helps reduce this stress. Cutting back will not harm your plants but will help in their establishment by promoting new root and shoot growth once planted.

I planted this penstemon Sour Grapes last year in a raised bed, semishaded. It made a huge amount of growth but had few flowers last year. This year I cut it back a bit and it has grown rapidly but again with very few flowers. Should I have cut it back hard in the spring, or do I need to move it to a sunnier position?
Penstemons do prefer a full sun position, with good drainage. Also a sheltered position is always helpful. As you suggest a good cut back in spring, would be excellent.

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