What's the Difference Between a Boston Ivy & a Sub Zero Ivy?

Appearance

• Both ivies are twining vines that can grow to a significant height if given support. Although their leaves are a similar three-lobed shape -- sometimes Boston ivy has compound leaves composed of three leaflets -- they differ in that Boston ivy is deciduous and sub-zero ivy is evergreen. Boston ivy produces flowers in early summer, followed by bluish-black berries. Sub-zero ivy, like all English ivies, grows in two stages: a sexless juvenile stage and a fall-flowering adult stage. Adult leaves are generally round, lacking lobes.

Seasonal Color

• Sub-zero ivy does not offer much seasonal color. However, its leaves emerge a bright lime green in the springtime, slowly fading over the course of the summer and fall to a deep evergreen. Boston ivy, on the other hand, changes to bright reds, scarlets and purples in autumn. Boston ivy’s stunning fall colors develop best in sites where it receives full sun.

Culture

• Sub-zero ivy is hardy in U.S. Department of Agriculture plant hardiness zones 4 through 9, while Boston ivy grows in USDA zones 4 through 8. Boston ivy grows well in full sun or partial shade, in dry to medium-moisture, well-drained soils. Although it prefers full sun, it appreciates some protection in hot summer climates. Consider planting it in areas with a less-intense northern or eastern exposure. Sub-zero ivy grows well in full shade. A tolerant plant, it also grows in full sun and a wide range of soil types, but it prefers consistent moisture.

Invasive Status

• Both Boston ivy and sub-zero ivy can be invasive given the right growing conditions. However, while Boston ivy is slightly invasive in some parts of the United States, including California, English ivy is considered invasive across the country. Unless it is impossible to grow anything else in the area you want to cover, you should probably skip the sub-zero ivy.