Allium grosii Font Quer is a tertiary wild relative of a number of crops in the allium group, including onion (A. cepa L.), Welsh onion (A. fistulosum L.), leek (A. porrum L.), garlic (A. sativum L.) and chives (A. schoenoprasum L.).

Although Allium grosii has a restricted range, it is locally common and does not face any major threats. It is therefore assessed as Least Concern.

A. grosii  is endemic to Ibiza, Spain, where it occurs from the northern part of the island, including Cap Nunó, to the island of Tagomago (Castroviejo et al. in prep.). The extent of occurrence (EOO) is 150 km² (Commission of the European Communities 2009).

This species is locally common.

It grows in grasslands, on the base of limestone ledges, fallow land and in pine forest clearings (Castroviejo et al. in prep.).

There are no major threats to this species but livestock grazing poses a minor threat.

A. grosii is a tertiary wild relative of and potential gene donor to a number of crops in the allium group, including onion (A. cepa), Welsh onion (A. fistulosum), leek (A. porrum), garlic (A. sativum) and chives (A. schoenoprasum).

A. grosii is listed in Annex II of the EU Habitats Directive and is listed in Annex I of the Convention on the conservation of European wildlife and natural habitats (Bern Convention).

It was listed in the list of rare, threatened and endemic plants in Europe (1982 edition) (Council of Europe 1983) as Vulnerable (V), in the 1997 IUCN Red List of Threatened Plants (Walter and Gillett 1998) as Rare (R) (not Endangered or Vulnerable, but at risk) and in the Llibre Vermell de la Flora Vascular de les Illes Balears (Sáez and Rosselló 2001) as Least Concern. It was also listed in the Libro rojo de especies vegetales amenazadas de España peninsular e islas Baleares (Gomez-Campo et al. 1987).

It occurs in the following Natura 2000 sites: Costa dels Amunts, Els Amunts d'Eivissa, Nord de Sant Joan and Xarraca (European Environment Agency 2010).

No germplasm accessions of A. grosii are reported by EURISCO to be held in European genebanks (EURISCO Catalogue 2010). Germplasm collection and duplicated ex situ storage is a priority for this species.