A flower garden or floral garden is any garden or part of a garden where plants that flower are grown and displayed. This normally refers mostly to herbaceous plants, rather than flowering woody plants, which dominate in the shrubbery and woodland garden, although both these types may be part of the planting in any area of the garden.

Most herbaceous flowering plants, especially annuals, grow best in a flowerbed, with soil that is regularly dug over and supplemented with organic matter and fertilizer.

Because flowers bloom at varying times of the year, and some plants are annuals, dying each winter, the design of flower gardens usually needs to take into consideration maintaining a sequence of bloom and consistent color combinations through varying seasons. Besides organizing the flowers in bedding-out schemes limited to annual and perennial flower beds, careful design also takes the labour time, and the color pattern of the flowers into account.

Flower color is another important feature of both the herbaceous border and the mixed border that includes shrubs as well as herbaceous plants. Flower gardens are sometimes tied in function to other kinds of gardens, like knot gardens or herb gardens, many herbs also having decorative function, and some decorative flowers being edible.