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Your sentences aren't in the present tense. This would be present tense: The tree is so massive it even withheld the strongest storm. Now, regarding your past-tense sentences: The tree wa...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/14176 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Your sentences aren't in the present tense. This would be present tense: > The tree is so massive it even withheld the strongest storm. Now, regarding your past-tense sentences: > The tree was so massive it even withheld the strongest storm. (Not lasting fact) > > The tree was so massive it could have withhold the strongest storm. (Lasting fact) So yes, lasting facts should be written in the present tense (aside of few exceptions).