Assertion: appellation's vine | /r/HasProperty | grown on grafted
Facets:
value: since the phylloxera crisis
type: TEMPORAL
Source sentences:
text: Since the Phylloxera crisis, most vines are grown on grafted rootstock, with the notable exception of the Nacional area of Quinta do Noval, which, since being planted in 1925, has produced some of the most expensive vintage ports.