Seed dispersal part one. I'll post a few entries in the next week or two with some examples of different methods of seed dispersal. Himalayan Balsam (Impatiens glandulifera) is an annual which flowers in late summer. It enjoyed a brief popularity with Victorian gardeners but quickly jumped the fence to become a widespread weed/wildflower. 

 

 

  

 By this point in the year I. glandulifera has gone to seed. A closer inspection of the seed pods reveals why its rate of increase has been (literally) explosive. At a certain point the pods burst and the seeds are propelled away from the plant. It is said they can travel up to seven metres though I can't say I've put that to the test.

 

 I can't capture an image of the seeds in flight but squeezing the pod between thumb and forefinger shows the moment the seeds begin to pop. The pod spits them out as though a spring has suddenly been released. Furthermore Himalayan Balsam is a plant of stream sides and river banks; seeds sprayed into the water are taken by the current.