What kind of plant is this...?

Question

i planted a garden a few months back..i'm a newbie to the garden thing..this is my first one..i can't remember what plants are what..there is this one plant growing and i don't remember what see i planted there..the plant is almost 2ft and little green ball things are growing on it...they are really small whatever they are...and a cluster of them have now turned black...can anyone please tell me what they are.

Answer 1

It would help on a question such as yours to have a general idea of where you're located.  

If you're from North America, you may have one of my least favorite plants - ragweed:  

common ragweed:  http://www.muk.uni-frankfurt.de/01-image...

giant ragweed:  http://www.allergydoctors.com/images/rag... -  note the difference in the leaf shapes between the species.

The small green balls are the flowers which produce the pollen that causes allergies for many people, and these can become darker as the flowers fade and seeds are produced:  http://www.kuleuven-kortrijk.be/facult/w...

If that's not it, could you add your location or a photo of your plant (you'd need to use a digital camera and post the photo to a photo-sharing website and post the link here)?