Allium altissimum

{{Short description|Species of plant in the genus Allium}}

{{Speciesbox

|image=Allium altissimum.jpg

|image_caption=Inflorescence

|taxon=Allium altissimum

|parent=Allium subg. Melanocrommyum

|authority=Regel

}}

Allium altissimum, the tall onion, is a species of flowering plant in the family Amaryllidaceae, native to Central Asia, Iran, and Afghanistan.{{cite web |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:527568-1 |title=Allium altissimum Regel |author= |website=Plants of the World Online |publisher=Board of Trustees of the Royal Botanic Gardens, Kew |access-date=3 August 2021 |archive-date=3 August 2021 |archive-url=https://web.archive.org/web/20210803061759/http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:527568-1 |url-status=live }}{{cite web |url=http://planthardiness.gc.ca/ph_main.pl?lang=en&m=7m&speciesid=1001401 |title=Allium altissimum Regel tall onion |author= |date=14 April 2021 |website=Canada's Plant Hardiness Site |publisher=Natural Resources Canada |access-date=3 August 2021 }} Its best-known cultivar is 'Goliath'.{{cite web |title=Allium altissimum 'Goliath' |url=https://www.rhs.org.uk/Plants/138663/i-Allium-altissimum-i-Goliath/Details |date=2021 |publisher=The Royal Horticultural Society |access-date=3 August 2021 |archive-date=3 August 2021 |archive-url=https://web.archive.org/web/20210803061758/https://www.rhs.org.uk/Plants/138663/i-Allium-altissimum-i-Goliath/Details |url-status=live }}