Some old fashioned rose varieties like the Gallica rose species eg. Charles de Mills, Rosa Mundi and Bell de Crecy, spread by underground suckers, is some of the hardiest roses, will grow in most rose soils and would survive with absolutely no maintenance whatsoever.
In other instances in the wild, birds would eat some of the rose hip pips, excrete them via dropping and when the rainy season starts and seeds are now dry and cocooned in the droppings, they will start to grow into said cultivar, or it may even in rare occasions be a mutation of the cultivar..:)