In contrast to the city’s big, professional nurseries (and even the slicker little plant shops), Oasis is something of a guerrilla operation. Its seeds and cuttings are collected from Brisbane’s very streets, spirited back to Kelvin Grove and propagated in a private yard behind a large Queenslander. On Friday and Saturday, the yard opens to the public, who come to browse 1000-plus species of native and locally adapted plants at attractive prices.