Thuja Green Giant Hedge Plant Disadvantages

Potential Problems

• The 'Green Giant' cultivar began its life as a clone tree developed in a Danish nursery. This tree doesn't typically suffer from serious insect or disease issues, but it is not completely impervious. In addition to root rot, bagworms may infest this plant. These caterpillars feed on arborvitae leaves, defoliating the plant. The 'Green Giant' can also fall victim to scale, crawling insects that feed on the stems and leaves of arborvitae and juniper.

Hedge Use

• The rapid growth and ultimate size of the 'Green Giant' may prove prohibitive for gardeners who wish to use the cultivar as a hedge. This evergreen conifer grows about 1 foot each year, attaining heights of up to 60 feet, and spreads of up to 20 feet. Because the tree doesn't take well to regular pruning, other arborvitae varieties, such as the smaller 'Emerald Green,' may be more practical hedge choices.

Care and Climate Issues

• The fast growth rate of the 'Green Giant' makes it a rather thirsty plant. It needs weekly watering, and even more in extreme heat. As is the case for any species, some climates put the 'Green Giant' at a disadvantage. The cultivar's plant hardiness zone limitations make it a no-go for many landscapes in the far northern U.S. and in the southernmost portions of Florida, Texas and Louisiana, as well as Puerto Rico, Hawaii and the westernmost parts of California and Arizona.

Advantages

• In general, the 'Green Giant' cultivar offers gardeners a durable and virtually disease-free evergreen. This tree isn't picky about soil type. It grows in sunny or partially shady conditions, and withstands even heavy ice loads. The 'Green Giant' doesn't typically require pruning, adding points in the “low-maintenance” category. While its size keeps it from making a practical hedge for most homes, this majestic tree lends itself to use as a windbreak, screen or accent in a roomy landscape.