8,778 Nurul Jannah Abdullah 2020-02-17 http://temperate.theferns.info/plant/Rheum+rhaponticum Useful Temperate Plants Database. (2016). Rheum rhaponticum. Retrieved from http://temperate.theferns.info/plant/Rheum+rhaponticum https://herbgarden.co.za/mountainherb/seedinfo.php?id=96 Mountain Herb Estate. (2004-2020). RHUBARB - GARDEN. Retrieved from https://herbgarden.co.za/mountainherb/seedinfo.php?id=96