Cynara Cardunculus
Cynara cardunculus, commonly known as the cardoon, is a dramatic, statuesque perennial grown for its bold architectural form, silvery foliage, and eye-catching purple thistle-like flowers. Closely related to the globe artichoke, it adds Mediterranean flair and striking vertical presence to both ornamental and edible gardens.
Type: Perennial (often grown as a short-lived perennial or biennial)
Common Name: Cardoon
Flower Colour: Purple
Height: 2.5m (8ft)
Spread: 1.5m (5 ft)
Flowering Time: June to September
Hardiness: RHS H5
Position: Full sun
Soil: Fertile, well-drained soil; benefits from a sheltered spot
Cynara cardunculus forms a large clump of deeply cut, silvery-grey foliage that emerges in spring and quickly develops into a bold mound. In summer, tall flower spikes rise above the foliage, each topped with a large, thistle-like flower head in rich purple tones. These blooms not only provide visual drama but also attract bees and other pollinators.
Due to its size and commanding presence, cardoon is ideal for the back of large borders, gravel gardens, or as a focal point in wildlife-friendly planting schemes. Its silvery foliage contrasts beautifully with greener planting and helps brighten dry, sunny corners of the garden.
The nectar-rich flower heads are a magnet for bees, butterflies, and hoverflies. Leave spent flower heads to go to seed for architectural winter interest and to support seed-eating birds.
While grown primarily as an ornamental plant in most UK gardens, the blanched leaf stems of cardoons are edible and considered a delicacy in Mediterranean cuisine. They require preparation and cooking but can be a unique addition to the kitchen garden for adventurous cooks.
Watering: Water well during dry spells, especially in the first season while establishing.
Feeding: Mulch annually with well-rotted compost or manure in spring to promote vigorous growth.
Pruning: Cut down flower stems as they emerge in summer if you want to grow it as a foliage plant
Overwintering: In colder regions, mulch heavily in autumn or provide fleece protection to help the plant overwinter successfully.
Dividing: Large clumps can be divided in spring if needed.
Cynara cardunculus is rated RHS H4, making it hardy throughout most parts of the UK. It prefers sheltered, sunny sites with good drainage. In exposed or very cold areas, it may benefit from winter protection to ensure it re-emerges reliably in spring.
Pair cardoon with:
These companions echo its Mediterranean roots and enhance its striking form and texture.
Cynara cardunculus is a show-stopping plant that brings structure, wildlife value, and a touch of drama to any garden. Whether you grow it for its ornamental beauty or culinary potential, it’s a rewarding choice for gardeners seeking something out of the ordinary.
Plant Cynara cardunculus for bold foliage, summer colour, and a vibrant centrepiece that supports both pollinators and your garden design.
Buying Perennials from Jacksons Nurseries
At Jacksons Nurseries we lightly trim back our perennials after flowering and trim them back at the end of the season to ensure that the plants remain neat and tidy whilst in the pot. The more tender the plant the less we cut back to help protect exposed stems from winter frost. Depending on the plant variety we will then prune back further in spring once the risk of the more severe frosts is over.
As a result, depending on the time of year you buy perennials, they may not look like images showing their ‘prime time’ in flower and looking at their best.
From late autumn onwards and dependent on variety, there may be very little visible above the soil except for a few cut back dormant leaves or stems. It is perfectly normal for dormant plants to look like this from autumn onwards, they will however burst back into life in spring.
Availability: Stock availability figures are provided as a guide only. There is a delay between orders being placed and the plants being gathered by our pulling team. During this time it may be possible for a member of the public to purchase these plants from our Garden Centre, while this is rare it is a possibility and we will notify you of any problems as soon as possible. This figure may also include plants that have not yet be flagged as unsaleable.
Pre-order: Pre-order times are given as a guide only and may vary dependent on the growing season. Orders containing Pre-ordered products will be shipped as a single order when all items become available. Large orders may be part shipped, please contact us on 01782 502741 or email sales@jacksonsnurseries.co.uk.
Perennials are described and classified differently by different gardeners but all would agree that they are plants that come into flower every year from early spring to late summer, the exact time dependent on variety and most die back to ground level in autumn and winter.
As for all plants, soil preparation is time well spent. Dig over the area to be planted ensuring that the ground is free draining. If not then you may wish to either consider planting in a different spot or raising the level of the planting area by adding additional topsoil, well rotted garden compost and/or well rotted manure. Add ‘Fish, Blood and Bone’ fertiliser or a high potash fertiliser to encourage good root growth and development.
It’s always a good idea to plant a few of the same plant together, we recommend planting in 3’s or 5’s to provide a bold effect but allowing them plenty of room to develop.
Always check eventual plant heights when planning borders to ensure that the taller plants are at the back (or at the centre of an island bed) followed by the medium and then smaller low growing plants.
Remember to deadhead perennials after flowering, trim back lightly in autumn as required to tidy the border and if necessary trim again in spring once the risk of heavy frost has passed.
If perennials get too big, start to flower less and less or if it seems to be dying off from the centre, consider dividing the plant but always check that the particular variety is happy to be divided and that you divide at the right time of year for the plant.
By using this simple guide and a little time, perennials can make an absolutely spectacular difference to your garden.
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