English holly (Ilex aquifolium) is a Class C invasive species in Portland (see the Portland Plant List). It is a broadleaf evergreen tree or shrub that typically grows to about 6-15 feet tall.

There are hollies with variegated leaves, such as the English holly, Ilex aquifolium “Ferox Argentea.” Most hollies produce red berries, but some produce orange, yellow and even black or white ...

Ilex aquifolium ‘Alaska’ is particularly good at smothering itself with vivid red berries. In leaf it looks like the species, but in form has an upright and narrow habit.

Classic English holly (Ilex aquifolium) would perish during our cold winters, ... To produce berries, all hollies require a male plant and a female plant, Snyder said.

Once you notice the intriguing variability of holly leaves, it is hard to know where to stop. The ultra-prickly cultivars, such as Ferox Argentea, are deservedly popular. But my own best-in-garden ...