You’re growing morning glories? On purpose? Are you crazy? Those things will take over your garden! Our friends, who live in wet western Washington, were appalled. They couldn’t understand why I’d plant something so invasive.
Yet, I’ve grown morning glories for years, first in California’s benign climate, then here in Colorado. I’ve never found them to be at all invasive. True blue flowers are hard to find. I couldn’t understand why our friends, avid gardeners, wouldn’t want to grow something so lovely.
Most gardeners are all too familiar with bindweed, a member of the morning glory family. With its white to pink vase-shaped flowers and elongated green leaves, it spreads its twisting vines across areas of disturbed soil, such as vegetable gardens and flower beds. The more the gardener tries to pull it out, the more it spreads. Reproduction is by seed, which can remain viable in the soil for up to 50 years, and creeping rhizomes, which may extend up to 6 feet from the mother plant.
If that doesn’t scare you, consider that established plants have a taproot that can extend 20 feet below the soil surface, and lateral roots that grow 30 feet long! This root system stores enough food to keep the plant alive for three years, even if the area above it is paved over. Repeated applications of herbicides may not kill those roots. Once an area is covered by bindweed, it is almost impossible for native plants (or anything else) to become established.
There are aliens among us. They didn’t come from outer space. Instead, they invaded our country from their native lands around the world. Some hitchhiked in bales of hay or on unsuspecting travelers. Others were brought here deliberately, perhaps for their beauty or stalwart endurance in the face of adversity.
Once here, they took advantage of our hospitality and spread far beyond their original destination. These invaders are plants: grasses, flowers, even trees that are taking over our country. It’s time we fight back.
When aggressive plants arrive in a new environment, they upset the delicate ecological balance that sustains birds and other wildlife. We call them “noxious weeds” because they tend to take over the landscape, are difficult to control, and out-compete more useful natives. They are frequently useless as wildlife forage or shelter, while replacing plants on which wild creatures depend.