A rose garden or rosarium is a garden or park, often open to the public, used to present and grow various types of garden roses, and sometimes rose species. Designs vary tremendously and roses may be displayed alongside other plants or grouped by individual variety, colour or class in rose beds. Technically it is a specialized type of shrub garden, but normally treated as a type of flower garden, if only because its origins in Europe go back to at least the Middle Ages in Europe, when roses were effectively the largest and most popular flowers, already existing in numerous garden cultivars.