The Garden Warbler nests in deciduous-rich forest and scrubland with dense undergrowth, preferably in damp areas and woodland edges. The nest is a sparse, cup-shaped construction of grass stems, placed low in a dense bush or in tall herbaceous vegetation. The female normally lays 4–5 eggs, and both parents share in the incubation, which lasts about 11–12 days. The young are fed by the parents and leave the nest after only about ten days. The species can live up to 10 years in the wild.