tree outside my house that smelled like semen

"That cummy smell comes from a flowering deciduous tree called Pyrus calleryana, better known in Australia as the ornamental pear, or the callery pear in the US. Originating from China, they became the urban designer's tree of choice in the 1950s because they're small, neat, and produce cute white flowers. Ornamental pears now line city streets around the globe, although they've fallen out of fashion in Australia and the US because they tend to self-germinate in vacant blocks—and as mentioned—the jizz thing. "

https://www.vice.com/en/article/7x4zza/heres-why-the-trees-on-your-street-smell-like-semen