I have made sourdough for 40 years, off and on, and created starters from a variety of sources. The local Elderflower trees are an endangered species, but I have several on my land. It was an experiment for me, to draw off the natural yeast to see what it would do.
Very floral the first year, so it makes a great starter for pancakes and sweet doughs. After that, it mellows into an all purpose sourdough starter.