Delicate but nice probably a weed?

Well here I am again.. another unknown plant appearing in a rather poor dahlia's plantpot in my garden. I am sure I have seen these before.. but what is it called please.

 

Looks like Nicandra physalodes. Common name shoo-fly.

http://www.google.co.uk/images?q=nicandra%20physalodes&rls=p,com.microsoft:en-gb:IE-SearchBox&oe=UTF-8&rlz=1I7SUNA_en-GB&redir_esc=&um=1&ie=UTF-8&source=og&sa=N&hl=en&tab=wi&biw=1255&bih=537

http://apps.rhs.org.uk/advicesearch/Profile.aspx?pid=538

 

Excellent Silver surfer. I googled earlier today and went to the same page as your link but failed to spot the listing. The bit about ' repels insects' is interesting..the only poor bit is it's short flowering time per flower head..the plant is very photogenic strong lines and contrasts...glad I did not weed it out. May have come via bird food.

 

Hans I agree with Nicandra and now you`ve got it, you`ve got it.:hehe::hehe::gnthb:

 

Its an annual - so keep some seed if you like it.

 

Very pretty =]

 

I will do that PeterS. My garden is a Everything welcome within reason ..sort of place and this plant is fine and has already caused a little conversation. And I now know what it is called . A great club.