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There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word: trellis'

Add an apostrophe s ('s) after the existing s at the end of the word: trellis's

Example:

All the the trellis' prices were too high so I bought a strip of wire Fencing.

All the the trellis's prices were too high so I bought a strip of wire fencing.

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10y ago

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