Hello, If anyone can help with id-ing these plants while I learn the plant families, you are more than welcome! First one is growing everywhere, seems to be competing heavily wherever there is sunshine. Second one has huuge leaves, more of a shade-tolerant plant, I think. 3 and 4 I found in patches under fruit trees and number 5 is a 2m tall shrub. Thank you!
#2 - Burdock, Arctium sp. #3 - Chelidonium majus #5 - are you sure the leave and berries belong to a shrub and not to a vine climbing over it? Looks like Bryonia to me. See http://www.flickr.com/photos/digitplantimages/3993128216/in/set-72157615465084127
Spasibo, Tyrlych! Will have a look at nr 5, my garden is a jungle, so could be that it is actually a vine plant.