|1||15C+||Indoor||Grow as a houseplant or under heated glass.|
|2||10 to 15C+||Indoor / Outdoor||Grow indoors, or outdoors in summer in a sheltered spot|
|3||5 to 10C||Tender||Grow outdoors in summer, and in a heated glasshouse in winter.|
|4||1 to 5C||Tender||Grow outdoors or under glass without risk of frost.|
|5||-5 to 1C||Half-Hardy||Hardy in coastal/mild/sheltered areas. Will not tolerate hard/sudden frost. May require winter protection in situ. such as fleece or straw mulch.|
|6||-10 to -5C||Hardy||May suffer at altitude, central/northerly locations, harsh winters, cold gardens and when grown in pots.|
|7||-15 to -10C+||Hardy||Will survive most severe winters but may be at risk in central/northerly locations and in pots. Top growth may be destroyed but will usually re-grow.|
|8||-20 to -15C||Hardy||Will survive severe winter, but may need protection when grown in pots.|
|9||-20C & Colder||Very Hardy / Hardy||in the severest European climates.|
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Originating from Mediterranean
An architectural, evergreen sub-shrub with blue/green foliage and great fat domes of sulphur coloured flowers in spring/early summer. It looks very special in a Mediterranean-style gravel garden.
The Edwardian gardener, Gertrude Jekyll, used this as one of her signature plants to add impact to mixed planting schemes, calling it ‘the grandest of plants’.
After flowering cut all flowering stems back to the base. This keeps the plant bushy. Un-pruned it looses its compact shape and becomes leggy.
It naturally occurs in rocky slopes in Portugal and will grow in poor, dry soil in sun in the UK but for really magnificent plants grow in moist but well-drained, reasonably fertile soil.
Mature height and spread after 2 – 3 years 1.5m x 1.5m