Can anyone tell me if San Gabriel English Holly is invasive ? (i.e. Ilex aquifolium 'San Gabriel'). The nursery selling it claims it is non-invasive. Some information gleaned from the Internet: "The tall and vigorous ‘San Gabriel’ holly is a self-fertile female variety that produces sterile red fruits in the absence of a male tree." But what happens if there are male common English holly plants in the vicinity ? Will the self-fertile female San Gabriel plants then be pollinated to produce berries with seeds that can propagate when birds distribute these seeds ? Thanks for any help. Jim
Presumably so. There is still also the leaf miner and leaf spot problems. I'd plant a Highclere holly instead, these are more impressive visually and I've see no indication of them invading woodlands here. One year during a visit to Van Dusen I saw most of the English hollies had ~bare lower branches due to leaf spot and the Highclere hollies did not.
