The Chilean blue crocus, a real eyeful - and it's not a crocus!

By: Sue Skinner - 28/02/2011


Once thought extinct in the wild, the stunning blue-flowered Chilean blue crocus was rediscovered in the Andes near Santiago, Chile, in spring 2001. You can see it flowering now in the Davies Alpine House.

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The native habitat of Tecophilaea cyanocrocus is the high Andes, where it grows on dry stony slopes from around 2000 to 3000 m altitude. In the wild it flowers in the Southern Hemisphere in spring, from October to November, and here in the UK from February into March. It immediately catches your eye in the Davies Alpine House with its amazing, deep blue flowers.

 

Flowers of Tecophilaea cyanocrocus

Tecophilaea cyanocrocus in the Davies Alpine House

 

With its crocus-like flowers it soon became known as the Chilean blue crocus although this plant is not actually a crocus but in a completely different family, Tecophilaeaceae. As well as the true species, two cultivars are also grown at Kew: Tecophilaea cyanocrocus 'Violacea' has flowers of a slightly more purple hue and T. cyanocrocus 'Leichtlinii' has more white in its petals.

 

Flower of Tecophilaea cyanocrocus Violacea  Flowering plant of Tecophilaea cyanocrocus 'Leichtlinii'

Left, T. cyancocrocus 'Violacea', and right, T. cyanocrocus 'Leichtlinii'

 

Cultivation

We grow this eye-catching plant in pots in the Alpine Nursery but there are also some growing outside on the Rock Garden. Early each spring pots from the nursery are displayed in the Davies Alpine House.

Cultivation is quite straightforward. We use a free-draining compost and re-pot the corms each year in August. After re-potting, we plunge the pots in a sand bed, and water both the pots and the sand. The sand is kept damp until the corms come into growth, when we water them freely. Watering is eased off as the plants die back for their summer rest. During this resting period, the pots are sprayed over about once a fortnight, as they don't like to be dried out completely.

We keep the pots in a glasshouse to protect them from hard frosts but they will often survive outside in milder parts of the country, as long as they don't get too wet in the summer.

 

Pots of Tecophilaea cyanocrocus in the sand plunge in the Alpine Nursery

Pots of Tecophilaea cyanocrocus in the sand plunge in the Alpine Nursery

 

Propagation

Propagation is mostly by corm offsets, though occasionally we will sow seed in spring. Seedlings are left undisturbed in the seed pots for about three years. This means that when we come to separate them and put them into bigger pots, they have already formed a small corm, which is less likely to suffer damage during repotting. After about five years they should flower and dazzle you with their electrifying blooms.
 

- Sue -

 


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About us

Looking north towards the Davies Alpine House from the Rock Garden

Several people contribute to the Alpine and Rock Garden Team blog. Richard Wilford is the Collections Manager in the Hardy Display Section at Kew. His responsibilities include all the areas where alpines are grown at Kew Gardens. The three team leaders, Joanne Everson, Graham Walters and Katie Price, each have their own particular parts of the Gardens to look after. Between them, these four experts have over 55 years experience of growing alpines.

Alpines at Kew Gardens are not only grown to create colourful and informative displays, they also play an important role in the research Kew carries out around plant naming, classification, biodiversity and conservation.

Mountains are found on every continent and each range has its own unique alpine flora, but these plants are under threat from climate change. As temperatures rise, alpines are forced higher and will eventually have nowhere to go. The alpine collections at Kew are studied to help us all understand the mountain flora better and make informed decisions about protecting its future.

"Probably the most beautiful glasshouse in the world is the Davies Alpine House at the Royal Botanic Gardens Kew", John Hoyland, Gardens Illustrated, April 2011

Richard Wilford has written a book on alpines, 'Alpines from Mountain to Garden', published by Kew Publishing. You can buy it in the Kew shops or from Kewbooks.com.

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