How to Grow Morning Glories

One thing that I look forward to in the summer is being greeted by a profusion of morning glory flowers as I leave for work. I deliberately plant them along the fence at the end of my driveway so that I have a cheerful sendoff each day until the frost in the fall. My favorite are the classic Heavenly Blue morning glories.

Morning glories are annual vines that grow from 5 to 15 feet in length. The leaves are dark green and shaped like hearts. The flowers are trumpet shaped. They open in the morning and close in the afternoon. Each flower only lasts for a day. The flowers come in a range of colors. The classic is bright blue, but they can also be red, pink, white, purple and bicolor. The flowers are a magnet for butterflies and hummingbirds.

Morning glories readily self-seed in your garden. They can become invasive so many community gardens ban them. Some states ban them also. When that is the case, seed catalogs will note that the seeds cannot be shipped to those states.

Morning glory flowers open in the morning and close in the afternoon. However, if the vines are planted in a location that the sun does not reach until the afternoon, the flowers will open in the afternoon instead of the morning. I have noticed that on cloudy days, the flowers will either not open at all or if it is light enough, they will stay open all day.

Moon flowers are related to morning glories. There are some key differences. Moon flowers open in the afternoon instead of the morning. They stay open through early evening and their white color appears to glow in the darkness. The flowers have a strong but pleasant fragrance. The flowers only come in white unlike morning glories which come in different colors including white.

Sweet potatoes are also related to morning glories. Their flowers and leaves are similar in appearance. The biggest difference between sweet potatoes and morning glories are the tubers produced by sweet potatoes. Morning glories do not produce tubers. Be aware that not all sweet potatoes are edible. The ornamental sweet potato vines that are grown for their foliage produce tubers that are not considered edible because of their terrible flavor. They are not poisonous. They just don’t taste like sweet potatoes.

Morning glories climb using tendrils which twine around just about anything. Most gardeners provide supports for their vines such are trellis, tepees, fences and pergolas. The vines will even climb string. In my own garden, morning glories climbed my butterfly bush.

The vines grow and climb rapidly and can cover fences or even the walls of buildings if they have trellises. Many people use morning glories growing on fences to screen air conditioning units or garbage cans. If the vines do not have support in the vicinity, they will grow along the ground, twining around other plants and each other.

Growing morning glories from seed is easy if you know the secret to getting the seed to germinate. The seeds have a hard covering that prevents them from germinating if you just plant them in the ground. You have to soften the hard covering. Most people nick the covering using something like nail clippers and then soak the seeds overnight. Other people use sand paper to wear down the covering before soaking the seeds overnight. Personally, I just soak the seeds overnight. That softens the hard seed coat so much that when I go to plant them the next day, some of the seeds have already germinated.

So what’s the best way to soak the seeds? Most people use wet paper towels. They moisten the paper towels and wrap the seeds in it. I’m a fan of reduce, reuse, recycle so I try to avoid using disposable items like paper towels. I use teacups instead. I partially fill a teacup with water and then drop the seeds in. Because I have cats that like to drink out of anything that has water in it, I cover the teacups with saucers. If I am soaking more than one kind of seed, I place the empty seed packet under the teacup and saucer to identify the seeds that are soaking in each cup.

If you live in a northern climate or you want flowers are soon as possible, you may want to start your seeds indoors 4 to 6 weeks before your last frost date. Most of us direct sow our seeds in the spring after our last frost when the soil has warmed to at least 60⁰F. Choose a spot with well-drained soil that gets full sun which means 6 to 8 hours of direct sun every day. Plant the seeds ¼ inch deep and 6 inches apart. Keep the soil moist until your seeds sprout. After that, you can cut back on watering your plants to just 1 inch a week. A thick layer of mulch will help the soil retain water so that it doesn’t dry out between waterings.

Fertilize your vines every 4 to 5 weeks with a low nitrogen, high phosphorous fertilizer. Too much nitrogen will result in all foliage and no flowers. The vines will produce flowers all summer whether you deadhead them or not. You might want to deadhead the flowers to prevent the vines from producing seed that will result in a bumper crop of morning glories next year. The seeds are easy to harvest if you would like to save some of the seed for next year.

Morning glories are pretty much disease resistant. They aren’t bothered by insects either. It’s four legged pests that can cause the most damage. Deer, rabbits and ground hogs all find morning glory vines delicious. To prevent them from eating your vines, place a 3 to 5 foot fence around your vines. As the vines grow, they will grow through the fence so that it will no longer be seen. At this point, the vines will be long enough that if a hungry deer or other pest starts nibbling, it won’t kill the vines.