Hi All,
Since I learned a few years ago of the dangerous situation that bees and butterflies are in worldwide, I'm always trying to make people more aware of our little friends. If they become extinct we will be in deep trouble.

My house plot is on a limestone karst https://en.wikipedia.org/wiki/Karst and when building I decided to have no grass only rockeries. There is one to the front and another to the side of the house.
I covered the areas with sandstone pea-gravel and just let the limestone outcrops protrude. I then filled in here and there with some low cover plants that are suited to acidic conditions. The only maintenance involved was a few days a year pulling weeds. I'm NOT a gardener!
Last year an invader took hold in the side rockery. I didn't know what it was and was about to uproot the 'weeds' but when I looked closer I noticed that there were a load of bees taking pollen from the little pinkish / white flowers. I left well enough alone and the little invader has now taken over most of the two rockeries.
I have identified the plant is Sedum Anglicum (English Sedum) https://en.wikipedia.org/wiki/Sedum_anglicum. In winter it becomes a nice low carpet of succulent green/gray plump leaves and in summer it comes alive with in sea of flowers with a multitude of visiting bees and the odd butterfly. Today I counted well over 80 bees and the odd butterfly all busy working away.

I'm leaving the 'invaded' alone and hope it helps the local bee population also the butterflies and other pollinators to continue working hard for us even though we appear to be doing our best to make them extinct.
Here in Ireland more than half of our bee species have undergone substantial declines in their numbers since 1980.Β The distribution of 42 species has declined by more than 50%!
Great efforts are being made my our National Biodiversity Data Centre http://www.biodiversityireland.ie/projects/irish-pollinator-initiative/ to raise awareness with novel approaches which should particularly appeal to kids and adults alike.

Plant something that bees and butterflies will like and enjoy watching them at work, it very relaxing 
And please let me know how YOUR country's bee and bug populations are doing?
Mike