According to our database for vegetables, watercress has 45mg/kg fresh weight.

All the best

I found the following link useful, it's a USDA Database for the Flavonoid Content of Selected Foods, Release 3.2 (November 2015)

http://www.ars.usda.gov/SP2UserFiles/Place/80400525/Data/Flav/Flav3.2.pdf

Regards,

Dear Dr Yohanes Kristianto,

Many thanks, good document.

Best regards

Aly

what is the difference between Oregano, Mexican, dried and Oregano, Mexican, fresh?

does it mean dried leaves or roots?

Sumarizing the information provided here, the highest concentrations would be in Oregano mexican dried (1028 mg/100g) and Celery seeds (762 mg/100g)

Dr Yohanes Kristianto - Brilliant link, thank you