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How to Grow Gladiolus

Updated on March 16, 2016
LisaRoppolo profile image

Lisa is a writer and gardener with extensive knowledge of plants and plant care. Her articles focus on easy-care tips for home gardeners.

History of Gladiolus

The name, Gladiolus (singular, Gladioli), is a root of the Latin word, Gladius, which means sword. These showy plants are indeed very sword-like in their foliage. They are related to Irises, which is another plant with similar sword-like foliage. There are about 250 different species of Gladiolus, which originated in South Africa, Asia and the Mediterranean regions of Europe.

Pink and Yellow mixed Gladiolus
Pink and Yellow mixed Gladiolus | Source

About Growing Gladiolus

Glads are grown from bulbs that are called corms. They are technically a perennial, but treated as an annual in some locations. They are not frost tolerant, so in Zones 6 and below, they need to be dug up and stored in the winter months.

Gladiolus do well in Zones 5 through 10 in full sun and they are not too picky about the soil they are planted in. It should be loose and well tilled at planting time.

They come in a wide range of colors including pink, red, purple, white, orange, yellow and multi-colored variations. Mixed bags of bulbs are pretty inexpensive as well. Height depends on variety, as they can grow anywhere from 2 feet to 6 feet tall, which make it a great plant for the back of a flower bed.

Growing Instructions

Growing Gladiolus are very easy!

  • Plant corms after danger of frost (Zones 5 and 6), earlier if in warmer climates.
  • Loosen the soil and plant about 4 inches deep with the pointed end up.
  • Space your corms 3 to 6 inches apart to ensure good air circulation between the plants.
  • Water 1 inch of water per week if your area isn't getting enough rain.
  • If you are growing varieties that are tall, you may want to stake them or you can inter-plant them with other tall plants that do not need staking to help them stand up.

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Best Garden Uses of Gladiolus

Glads are great back of the border plants to add height to your landscape design. The shorter varieties do really well in pots with shorter or trailing plants, adding a lush design to your planter. When using Glads in your landscape, they look the best planted en masse rather than one or two planted here or there. There is a lot of versatility with these plants that lend them to both formal and native garden designs.

"Laguna" variety of Gladiolus
"Laguna" variety of Gladiolus | Source

Some Pests and Diseases to Look Out For

Glads are pretty easy growers but can become susceptible to pests and disease. Aphids and Spider Mites are the most common pests. Inspecting your plants regularly can help catch them early before a major infestation occurs. I personally have not had any issues with either, but it is always something to look out for regardless. Another common problem is Gray Mold, which is a fungal disease, usually brought on by too much moisture. Ensuring good air circulation and proper watering can prevent this disease. If you do notice Gray Mold on your plants, it is best to dig and discard them because it can spread to your other healthy plants.

Gladiolus in purple
Gladiolus in purple | Source

Proper Watering Techniques

While we are on the subject about moisture, I feel it is important to go over some basic guidelines of proper watering. You would not believe how many people I see in my own neighborhood watering improperly. Proper watering will ensure you do not introduce mold, powdery mildew and a host of other fungal diseases that thrive on moisture.

  • Never water overhead. Instead, water at the base of the plant.
  • Water early in the day as opposed to evening. This will ensure the plant foliage has a chance to dry out.
  • Remove any debris such as plant cuttings or leaves from around the base of the plants. Debris can hold moisture and harbor diseases, which can spread to your plants.

How to Store Gladiolus for Winter

Consider yourself lucky if you live in Zones 7-10! You only need to provide a bit of mulch or straw to your plants to help them over-winter in your garden. For those of us in Zone 6 and below, a few extra steps are needed to store these bulbs so they can be re-used in the next growing season:

  • After your first frost, dig the entire plant including the corm.
  • Cut the foliage to 1 inch above the corm.
  • Dry the corms in the sun outside for 1 to 2 days.
  • Dust off the excess soil when dried.
  • You may choose to dust them with a bulb fungicide before storing.
  • Store them in paper bags, cloth bags, wire racks or anything that can be hung or stacked ensuring enough air circulation so they do not mold.
  • Store between 35 and 45 degrees in a low-humidity environment. Basements or Cellars are good places.
  • Replant in spring after danger of frost!

Gladiolus in hot pink
Gladiolus in hot pink | Source

Handy Bulb Planter

Comments

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    • Pawpawwrites profile image

      Jim 3 years ago from Kansas

      This makes me want to grow some.

    • LisaRoppolo profile image
      Author

      Lisa Roppolo 3 years ago from Joliet, IL

      Thanks, happy planting!

    • purl3agony profile image

      Donna Herron 3 years ago from USA

      I love glads and was thinking about planting some in our garden. I didn't know the details about how and when to plant them, but your hub has answered all my questions! Thanks so much! Pinning to my gardening board!

    • LisaRoppolo profile image
      Author

      Lisa Roppolo 3 years ago from Joliet, IL

      Thank you! I agree, they are fantastically beautiful!

    • pstraubie48 profile image

      Patricia Scott 3 years ago from sunny Florida

      These are one of my most favorite plants. My Momma had fields of them growing around our property ...all colors with the gorgeous blooms. I love growing them now as it brings back that time of my youth.

      Lovely photos

      Angels are on the way this afternoon. ps

    • LisaRoppolo profile image
      Author

      Lisa Roppolo 3 years ago from Joliet, IL

      Thanks for your comments. Here is wishing for Spring weather during this dreary month! :)

    • Glimmer Twin Fan profile image

      Claudia Mitchell 3 years ago

      What a nice hub on a gray day here in NW PA. I love gladiolas and they are a nice old fashioned flower for the garden. Unfortunately they are work for me because I have to remove the bulbs in the winter. Thanks for the pick me up hub and reminder to get my bulbs ordered since I am already getting catalogs in the mail.

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