Probably not serious, but you wouldn't want an issue on a technicality.
tl;dr: Posts painted entirely purple are more than is required.
Texas Penal Code § 30.05. Criminal Trespass
Sec 2 (D) the placement of identifying purple paint marks on trees or posts on the property, provided that the marks are:
(ii) placed so that the bottom of the mark is not less than three feet from the ground or more than five feet from the ground; and
.... this seems quite clear that the mark needs to end 3 to 5 feet above the ground
.... a post painted all the way to the ground is just a purple post, not a purple-marked post
... at least it's an upgrade on a rusty old pipe
Doesn't the "not less than" part mean that you can paint it more if you so desire
Don’t think so. I am not a lawyer but that reads as “at least” to me. E.g. two feet or even no feet is “less than” three feet and so fails the “not less than” test. I assume the point being that it shows as a clearly applied mark rather than simply happening to be a purple bit of material that was used to it make a fence.
It may be that it has become common for the posts to be wholly purple and it will be thus generally understood that that is equally acceptable.
I read that as a minimum requirement that you can exceed if you so desire. But I'm not a native speaker.
I don’t think so, though I agree it is poorly worded. I believe what it is trying to say is that the bottom (i.e. the lowest point) of the mark must be between 3 and 5 feet above the ground.