Piet Oudolf is a Dutch garden designer, nurseryman and author. He is a leading figure of the "New Perennial" movement – his designs and plant compositions using bold drifts of herbaceous perennials and grasses which are chosen at least as much for their structure as for their flower color.

A garden designer is someone who designs the plan and features of gardens, either as an amateur or professional. The compositional elements of garden design and landscape design are: terrain, water, planting, constructed elements and buildings, paving, site characteristics and genius loci, and the local climatic qualities.