From Liza Picard's 'Victorian London' (fascinating book)
"Most small gardens then ...are laid out with a piece of grass, called a lawn, in the middle, surrounded by flower beds. More formal layouts were giving way to child-friendly grass.... A machine for mowing lawns had been invented as long ago as 1830"
"If you wanted to cut down on lawn maintenance, you might favour a rockery... a gardening magazine aimed at the middle classes advised planting a rockery with cannas and Pampas grass"
Samuel Hereman of Pall Mall sold "Hot Houses for the Million" starting at £24 "for suburban villas and cottage gardens"
Popular trees included privet, lilac.laurustinus & syringa (philadelphus)
A cottager's garden cultivated by 'a mechanic or artisan' would have roses, honeysuckle, sweet briars and summer jasmine, perennials such as monkshood and some irises, phlox, hollyhocks, polyanthus & other annuals.
"The great consideration is to have such as will thrive in a smoky atmosphere" (Think that quote is from 'The Cottage Gardener' a magazine)
References include Samuel Beeton'sBook of Garden Management, 1872, JC Loudon's The suburban Horticulturalist, 1842 and Brent Elliott, Victorian Gardens, 1986.