Typical Mediterranean vegetation, growing on the Rock of Gibraltar

Gibraltar is a UK Overseas Territory located in continental Europe. It is situated at the most southern tip of the Iberian Peninsula and occupies a small area of 2.64 sq miles. Gibraltar's most iconic landmark is the "Rock of Gibraltar", a spectacular outcrop of Jurassic limestone. The upper reaches of the "Rock of Gibraltar" comprise a nature reserve which is the home of the famous Barbary Macaques.

Barbary Macaques, Gibraltar is the only place in Europe where wild primates live Like many Mediterranean areas, Gibraltar has a very rich vegetation which can survive very hot and dry summer and cool, wet winters. However, its geological characteristics with underlying limestone rock and alkaline soils contrast with the surroundings which are sandstone with acidic soil. The geology of the Rock is more similar to the North African side of the Strait than to Spain. The combination of all these factors creates an exceptional environment for plant diversity. In Gibraltar there are more than 600 plant species from 330 genera and 90 families. Of these, three plants are endemic to Gibraltar and found nowhere else. These are: Silene tomentosa, Cerastium gibraltaricum and Saxifraga globulifera var. gibraltarica. In addition to these endemics, there are other species that are native to North Africa and Gibraltar is the only place in Europe where they are found. These are Iberis gibraltarica and Thymus willdenowii. Limonium emarginatum is endemic to the coastal areas on either side of the Strait of Gibraltar, with extremely important populations on the Rock.

Invasive species Opuntia ficus-indica spreading rapidly in natural habitats of the native palm Chamaerops humilis Threats to the native flora

With such a restricted surface area, the increase of built-up areas is one of the main threats to the native flora. Also, the decrease of management practices, such as the maintenance of some firebreaks within the nature reserve, puts at risk the continued existence of open ground and other important habitats for plants. Silene tomentosa being reintroduced in the wild by a member of the Gibraltar Ornithological & Natural History Society Some areas, and in particular important open habitats, are being invaded by non-native plant species, some of which have become a serious problem. Several non-native plants are threatening the native flora and raising serious concerns: Carpobrotus edulis (Hottentot fig) covers large areas of the eastern Sand Slopes and littoral areas; Pennisetum clandestinum occupies the northern end of the Windmill Hill Flats; Chasmanthe floribunda is spreading on some firebreaks and outcompetes other species with bulbs or corms; and the succulents Opuntia ficus-indica, Aeonium arboreum and Aeonium haworthii smother large areas of important cliff and rocky slope habitats.

Conservation efforts

The Upper Rock Nature Reserve is where many of the endemic and native plant species naturally occur. This nature reserve represents 40% of the land area in Gibraltar and has been protected by law since 1993. Within its boundaries it is completely forbidden to uproot any plants. Other important habitats that were excluded from the original designation are now protected under the EU Habitats Directive. The Gibraltar campion (Silene tomentosa) is probably one of the most important plants that occur in the Nature Reserve. This endemic species was re-discovered here in 1991 (it was previously thought to be extinct). Since then, a team from the Gibraltar Botanic Gardens has collected and kept seeds and grown adult individuals that were later reintroduced in the wild. The Gibraltar Botanic Gardens 'The Alameda' is setting up a living collection representative of Gibraltar and therefore contribute towards the conservation of the flora of Gibraltar. The 'Nature Protection Act' provides protection for a wide range of species, including the strictest protection for all plants endemic to Gibraltar, or for which the Rock forms an important component of its global distribution.

© Copyright Board of Trustees of the Royal Botanic Gardens, Kew
Gibraltar Botanic Gardens: The Alameda Gardens

Ornithological and Natural History Society Gibraltar

Kew collaborates with The Gibraltar Botanic Gardens and the Gibraltar Ornithological and Natural History Society (GONHS) on plant conservation activities.

Progress in implementing the Global Strategy for Plant Conservation Targets

  • Target 1
  • Species checklist complete
  • Target 2
  • Status of plants species known and legislated for accordingly
  • Target 3
  • Biodiversity Action Plan and Nature Reserve Management plan published
  • Target 4
  • Co-ordinated locally and internationally
  • Target 5
  • 75% of Important areas for plants protected, but effective management not yet in place
  • Target 6
  • Not applicable
  • Target 7
  • Upper Rock Nature Reserve established in 1993 and large areas of additional important habitat protected under the EU Habitats Directive
  • Target 8
  • Seeds of Silene tomentosa collected and banked at Gibraltar Botanic Gardens and in long-term storage in RBG Kew's Millennium Seed Bank; several species of conservation importance in cultivation at Gibraltar Botanic Gardens and at RBG Kew
  • Target 9
  • Not applicable
  • Target 10
  • Key invasive species identified
  • Target 11
  • No plant species in international trade
  • Target 12
  • No plant-based products produced
  • Target 13
  • No current indigenous use of plant products
  • Target 14
  • Field guide to the plants of Gibraltar and other relevant literature published
  • Target 15
  • Development is ongoing. The Gibraltar Botanic Gardens have some trained staff but more are required
  • Target 16
  • Strong international partnerships between Gibraltar Botanic Gardens and RBG Kew. Gibraltar Botanic Gardens is a member of BGCI and AIMJB. GONHS is a member of IUCN and UKOTCF

    Please use the links below to see further details on conservation activities in the UK Overseas Territories


    Ascension Island


    British Antarctic Territory

    British Indian Ocean Territory

    British Virgin Islands

    Cayman Islands

    Falkland Islands


    Pitcairn Islands

    South Georgia and the South Sandwich Islands

    Sovereign Base Areas on Cyprus

    St. Helena

    Tristan da Cunha

    Turks and Caicos Islands

    Homepage of the UKOTs Online Herbarium

    Site published by
    UK Overseas Territories Science Team, Royal Botanic Gardens Kew
    Please cite as
    UKOTs Online Herbarium (2011). Published on the internet at (date accessed).
    For further information
    Please contact Kew UKOTs Team

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