A lot of garden centre have sections on what plants that the bees find attractive so we sure and ask when you are buying a plant if it will make the bees happy.
Galway Beekeepers have a nice articles on plants that bees like and also on continuity of planting.
Even a small pot can help.
http://galwaybeekeepers.com/flora/
Read more https://connemaragreen.ie/action-5-gardening-for-bees/
