Rosemary is one of the herbs we have cultivated on the farm. I have a large patch outside my She Shed/Soap Studio.
It has been used in traditional medicine for centuries and is known for keeping insects away and improving memory which is one of the reasons why it associated with Anzac Day in Australia and Remembrance day in the UK.
The Australian War Memorial website states:
"Traditionally, sprigs of rosemary are worn on Anzac Day and sometimes on Remembrance Day, and are usually handed out by Legacy and the RSL. Rosemary has particular significance for Australians, as it is found growing wild on the Gallipoli peninsula."
According to the ANZAC portal
"Greek scholars believed the aromatic herb rosemary improved memory. Their students allegedly wore it in their hair during exams. In Roman times, people burned rosemary or placed it in tombs to honour and remember the dead. Pliny the Elder, who died in 79 AD, and other Roman writers described the use of rosemary in funeral ceremonies. It was a custom that eventually spread throughout Europe."
Why do we wear a sprig of Rosemary?
It is one of the main herbs in my Herby Essential Oil blend.
I also use it in the woody balm to make sure he remembers all those special dates if he uses it in his beard.
In Shakespeare's Hamlet Ophelia declares: ‘There’s rosemary, that’s for remembrance: pray, love, remember.’
This study found that that "R. officinalis had the ability of improving cognitive outcomes in normal as well as cognitively impaired animals. Results were robust across species, type of extract, treatment duration, and type of memory. The cognitive benefits provided by R. officinalis and its mechanisms of action are in synchrony with the fundamental pathophysiology of cognitive deficit and the herb could be a potential treatment for Alzheimer's disease."
Another study showed "for the first time that performance on cognitive tasks is significantly related to concentration of absorbed 1,8-cineole following exposure to rosemary aroma, with improved performance at higher concentrations."
The BBC wrote that there are compounds in rosemary oil that may be responsible for changes in memory performance. One of them is called 1,8-cineole - as well as smelling wonderful (if you like that sort of thing) it may act in the same way as the drugs licensed to treat dementia, causing an increase in a neurotransmitter called acetylcholine.
More links
https://pubmed.ncbi.nlm.nih.gov/10641130/