RHS Award Winner: Best Behaved Convolvulus

February 2nd, 2018 | Plant Talk with Graham Rice | 1 Comment

Convolvulus 'Blue Ensign'

I’ve often wondered why so few plant breeders have worked on improving the annual convolvulus, the dwarf morning glory. The wild species, Convolvulus tricolor, grows around the Mediterranean, especially on the African side, as well as in the Balearic Islands and it’s impressively colourful even in its natural wild form.

With blue edges to the bold trumpets, there’s a white ring and a yellow eye and in the spectacular ‘Blue Ensign’, included in the new Mr F range of seeds that have received the prestigious RHS Award of Garden Merit, the blue is a deep and shining shade.

‘Blue Ensign’ has the neat and restrained growth habit of a semi-trailing petunia with a combination of flower colours never seen in a petunia – and it’s a hardy annual. It’s related to bindweed, yes, but the whole plant dies after flowering.

And here’s the thing. The ‘Flagship’ mixture gives us a glimpse of the potential: so many other colours. Most of the colours have that starry yellow eye with a white zone round it but as well as flowers with deep blue edges there’s red, pink and pale blue edges as well as simpler pale blue and yellow and pale pink and yellow. They’re very pretty.

AGM winning ‘Blue Ensign’ is prolific and good in baskets and the front of sunny borders. ‘Flagship’(not an award-winner) is a little more variable in habit and flower-power, sometimes rather straggly, but I’m sure that with a little work neat and prolific plants could be developed in some lovely colour combinations.

In the meantime,‘Blue Ensign’ is easy to raise from seed sown outside and a packet of a hundred seeds costs only £2.05. I haven’t grown it for years but it’s on the list for this year. I’m going to plant it on the corners of my 1.2m raised veg beds – to hide my less than expert carpentry where the boards join!

  • Please take a look at my article on RHS award-winning lobelia for containers and borders in this week’s Amateur Gardening magazine – print edition only.

One Response to “RHS Award Winner: Best Behaved Convolvulus”

  1. Well done Graham. I have always found ‘Blue Ensign’ such a wonderfu plant so am delighted to learn that someone has been working to broaden the range of colours in this species. I haven’t grown ‘Blue Ensign’ for some years but must grow it again alongside the new ‘Flagship’ mixture.

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Is one of our best known gardening writers. A graduate of the Royal Botanic Gardens, Kew, Graham was previously Gardening Correspondent of The Observer.
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