Elaeagnus pungens, more commonly known as thorny olive, is a big, thorny, fast-growing plant that is invasive in some parts of the United States and hard to get rid of in many more. Native to Japan, the thorny olive grows as a shrub and occasionally as a vine that reaches anywhere from 3 to 25 feet in height. Thorny olive control can be difficult because of the long, sharp thorns that sprout from its branches, and because of the spread of seeds from its fruit. Keep reading to learn more facts on Elaeagnus pungens and how to control thorny olive plants.
Is Thorny Olive Invasive?
Where is thorny olive invasive? In Tennessee and Virginia it is, but it’s a nuisance in many other states as well. It’s hardy in USDA zones 6 through 10 and is easily spread through the droppings of birds that have eaten its fruit.
It’s also very tolerant of drought, shade, salt, and pollution, meaning it will spring up in all kinds of spaces and will often crowd out native plants. Thorny olive does have its place and is very effective as a barrier, but because of its propensity to spread, it is often not worth it.
How to Control Thorny Olive Plants
Managing thorny olive plants works best with a combination of manual removal followed up by chemical application. If your plant is large and established, you might need a chainsaw or at least hedge clippers to cut it back close to the ground.
You can dig up the root ball or, for an easier time, and spray the exposed ends of the stumps with a strong glyphosate solution. When the stumps sprout new growth, spray them again with a diluted glyphosate solution.
The best time to do your thorny olive control is before the plant fruits in the autumn, to prevent the spread of seeds.