Citations:fog

mist

 * 1843, Charles Dickens, A Christmas Carol:
 * The fog came pouring in at every chink and keyhole, and was so dense without, that although the court was of the narrowest, the houses opposite were mere phantoms.
 * He had so heated himself with rapid walking in the fog and frost, this nephew of Scrooge's, that he was all in a glow; his face was ruddy and handsome; his eyes sparkled, and his breath smoked again.
 * Meanwhile the fog and darkness thickened so, that people ran about with flaring links, proffering their services to go before horses in carriages, and conduct them on their way.

grass

 * 1684, Meriton, Praise Ale, l., page 147:
 * He... preaz'd to git ore'th hedge into our fogg.
 * 1785, Hutton, Bran New Wark, I., page 476:
 * Aur nebbour's stot or stirk break into'th fog.
 * 1808, William Humphrey Marshall, A review of the reports to the Board of agriculture, page 89:
 * When cattle are turned into a fresh clover "fog," especially in wet weather, they are sometimes hove, by the sudden fermentation of the clover:
 * 1847, The Farmer's Friend: a Record of Recent Discoveries, Improvements, and Practical Suggestions in Agriculture, page 15:
 * they must be forced forward with the best keep you can afford them, such as clover fog, old land fog, or young seeds; but care should be taken that ...
 * 1866, Journal of Horticulture and Practical Gardening, page 64:
 * Passing an ironmonger&#39;s shop displayed in large letters upon a printed card, was— "A Fog to Let." A "fog" was the second crop, or "after-grass," as it was sometimes termed, which sprang up after the first had been cut and made into hay.
 * 1881, Sargisson, Joe Scoap, page 73:
 * T'gurse theer was hofe a feutt deep ameast, an as thick as clover fog.
 * 1901 August 10, Whitby Gazette (quoted in the EDD):
 * Wanted. Gaiters [cows] for Fog land.

moss (per EDD, but could just be grass)

 * 1793, Sir John Sinclair, The Statistical Account of Scotland: Drawn Up from the Communications of the Ministers of the Different Parishes, page 325:
 * were the most miserable hovels, built of stone and turf, without mortar, and stopped with fog or straw, to keep the wind from blowing in upon them.
 * 1796, Lauderdale, Poems, page 47:
 * Some bits o' grass, some fog, some heather.
 * 1841, Susanna Hawkins, The Poems and Songs of Susanna Hawkins, page 41:
 * I wander'd o'er a bog, / Amang the heather an' the fog.

verb: to grow (grass or moss) (on a field, tree, etc) (?)

 * 1715, Alexander Pennecuik, A Geographical, Historical Description of the Shire of Tweeddale, page 31:
 * I have observed, that about this town [Peebles], both Fruit and Forrest-trees, have a smoother Skin then else-where, and are seldom seen, either to Fog or be Bark-bound, the Soil is so clean and good
 * 1743, Maxwell, Sel. Trans., 100:
 * The grass of it is become very sour, full of speets, and in many places fogged.
 * 1815, Board of Agriculture (Great Britain), General View of the Agriculture and Domestic Economy of South Wales, page 545-6, mostly quoting Mr. Hassall, "Original Report of Pembrokeshire":
 * On the above writer's demesne at Kilgwyn, some years after his death, we saw a piece that had been fogged successively for sixteen years;
 * "The next practice in the agriculture of this county, which I can venture to recommend to other counties, is that of fogging grass lands; that is, letting the grass grow from a fortnight before Midsummer, and not turning any stock upon it till February or March. "The practice of putting cattle from fog-fields into a straw-yard at night is so obviously advantageous, that I wonder any sensible farmer can overlook it; but the fact is such, that  by letting the cattle lie all night upon the fogged grass, it is materially injured.  "When land has been mowed too long, one year's fogging is supposed to recover it."
 * 1871, Milne, Songs, 121:
 * There's ploughmen here can labour leys [leas] / Though they were fogged years.