>>http://www.t-c-m-rd.co.uk/invasive-weeds/himalayan-balsam/
It leaves a long greyish-white stripe down their back.

I have some of this Impatiens glandulifera by me in NY.  It is mostly visited by bumble 
bees although this year (ample with rain) I also see honey bees going into the flowers.

This plant is supposed to be excellent source of nectar but I believe this is only the 
case in wet areas.  Last year was dry and I did not see honey bees on it despite many 
bumble bees.

There is a lot of jewel weed by me, too.  I can't say that I've seen honey bees on it 
although there may have to be special soil/rain requirements for this.

Waldemar

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