Laburnam trees are hard to miss in spring- they are covered in racemes of bright yellow flowers. They seem to be variable and adaptive in their growth habit. 

 My father planted three back in the day. The one shown above forms a branching, bushy low tree under the shade of Scots Pine. Nearby is one that grows between two tall Holly trees. It is narrow and must be about fifty or sixty feet high. At the front of the house is another that gets more sun. It is of medium height, the branches are thicker, the flowering more prolific and the foliage more dense.

 Wherever and however they grow Laburnams in flower attract bumblebees in profusion.