> After all, letting bee forage plants bloom
> would be  low cost alternative to regular mowing.

I understand that replacing grass verges with flowering plants is popular in 
some continental cities (Germany I think); it has cut the cost of 
maintenance (esp mowing) very significantly - and looks better.  There are 
some trials starting here in the UK.

Whether it is a good idea for bees to forage on potentially contaminated 
flowers may be a question that needs some research.  I do not think that I 
would wish to eat honey gathered from the verges of busy roads.

Best wishes

Peter
52.144442, -1.503509 

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