<p>Nectarines and peaches are valuable crops that require significant investment when establishing a new orchard. Orchard rejuvenation through grafting mature trees, known as top-grafting or top-working, provides a timelier and therefore more economical establishment of a fruit bearing orchard than whole orchard renewal. Limited research is available on stone fruit tree grafting on nursery seedlings and literature on top-worked fruit trees is lacking. There is also no information on how methods of irrigation would affect the growth and fruit yield of top-grafted nectarine trees. In this study, research was carried out in a mature peach orchard by top-working the peach trees with nectarine scions under three different irrigation methods: furrow, drip, and micro-spray. Tree growth and fruit production were evaluated from initial grafting to maturity over six growing seasons. The furrow- irrigated nectarine scions grew about 5% more than drip or micro-spray irrigated trees. Nectarine fruit size from furrow or micro-spray irrigated trees was 3% larger than from drip irrigated trees, but no significant difference was found in total fruit yield between the different irrigation methods. This research has demonstrated that furrow irrigation can benefit scion establishment in top-worked nectarines. Drip or micro-spray irrigation can be used after the trees mature for improved irrigation efficiency.</p>