USDA Hardiness Zone 3
RHS Hardiness Rating H7
In 1966 Paul Joy of the Windsor Road Nursery in New Hampshire hybridised Forsythia × intermedia ‘Lynwood Variety’ with the hardy selection F. ovata ‘Ottawa’ (Arbofux 2021). The resulting ‘New Hampshire Gold’ first blossomed in 1970; its drooping flowers are carried singly and are a deeper yellow than those of ‘Ottawa’. The habit is mound-like, to 1.5 m tall and autumn colour in Canada can be deep red (Dirr 2009; Stewart 2021). Michael Dirr has suggested that F. europaea was also involved in the parentage of this cultivar (Dirr 2009).