Thanks to all who responded!
There's a convention that, for landscape photography, one should focus at the so-called 'hyperfocal distance' whereby everything from half that distance to infinity will be in acceptable focus. However, there's a gentleman who breaks that convention by suggesting to focus at infinity, see:
www.trenholm.org/hmmerk/DOFR.html
Worth a quick read to get Merklinger's point, although he can be a bit loquacious ...
Now - we all know that modern lenses, even if they have an infinity mark, are not particularly good at focusing exactly at infinity -unlike older film camera lenses that usually have an accurate hard stop at infinity. Like, for example, my M42 Zeiss 20mm f/4 Flektogon.
So it is that, personally, I'll focus on something far, like the trees at end my street - some 1200 feet from where I usually stand. With the Zeiss lens at say f/8 the actual aperture diameter is 20/8=2.5mm and scene items bigger than that will be "resolved", especially distant stuff - but even nearby grass will remain obviously grass.