I was drinking dandelion tea and noticed that it flared up my eczema. So I researched and found out it is also related to ragweed! When I had flu tried some goldenseal but it flared me up too (also related)
(recently also found that emotions flare me up but that's another point).
According to this page (http://curezone.com/forums/fm.asp?i=1457463
) these foods can exacerbate ragweed reaction: melons, bananas, chamomile tea, honey containing pollen, sunflower seeds, zucchini, and cucumbers
and popular relatives of Ragweed are:
Milk Thistle (haven't used it much lately)
and lots of other flowers and herbs
(that page doesn't mention St John's Wort or Echninacea but should)
Yikes even lettuce is on there that's a bit much!