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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