Jaques d'Alltrades wrote:
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Can anyone suggest a trouble free tree?

To grow in California? Why do you think we would know in the UK?

Yew.

Until your neighbours goat eats some of it. A bit too toxic really.

Many of the dwarf conifers like juniper are pretty harmless. Flowering
cherry isn't bad either. But avoid things that attract sap sucking insects.

Slow growing trees that will ultimately be huge and become a real menace
are usually OK for the first few decades.

Regards,
Martin Brown