The plaque was unveiled on Monday at the Visitor Information Centre at the base of the Sequoia Sempervirens, which is otherwise known as a Californian redwood.

The Sequoia Sempervirens is slow growing, long living and large.

Former state forest employee Col Roberts said the Forestry Commission of NSW appointed Len Mors in 1954 to establish and train a workforce to expand the pine plantations in the Oberon area and to build an office to administer these operations.

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The office building was completed on the Ross Street site in 1956 and the Sequoia was planted shortly after as part of the site landscaping.

"Mr Mors, who passed away 12 months ago, was on Oberon Council and a member of the beautification committee. This is why Mr Mors selected such a beautiful species to live for many years," Mr Roberts said.

The Forestry Corporation moved its operations to Bathurst in 2000 and the building was handed over to Oberon Council. The building now houses the information centre.