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Growing Gladiolus
How to Plant, Grow, and Care for Gladioli
How to Plant, Grow, and Care for Gladioli
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Gladiolus is a classic perennial known for its tall flower spikes. A great cutting flower, gladioli look beautiful in midsummer bouquets. Here’s how to grow gladioli in your garden.
Available in a multitude of colors, gladioli grow between 2 to 5 feet in height.
The taller varieties, which should be staked, are often placed in the back of a garden to nicely complement shorter plants.
In Zone 7 and colder, gladioli corms need to be lifted in the fall and replanted the following spring.
Planting
- Plant gladiolus corms in the spring once the danger of frost has passed and the soil has warmed. See your local frost dates here.
- Gladioli like well-drained soil and full sun.
- Ready your garden by using a garden fork or tiller to loosen the soil to about 12 to 15 inches deep. After loosening the soil, mix in a 2- to 4-inch layer of compost or aged manure.
- If your grow gladioli primarily for cut flowers, plant them in rows. It’s easier to tend the plants and to harvest the flowers.
- If planted with other flowers in borders or annual bes, plant the corms in groups of 7 or more for best effect.
- To ensure large-sized blooms, plant corms that are 1¼ inch or larger in diameter.
- Set the corm in the hole about 4 inches deep with the pointed end facing up. Cover with soil and press firmly.
- Space the corms 6 to 8 inches apart.
- Water the corms thoroughly.
- If you’re planting tall varieties, be sure to stake them at planting time. Be careful not to damage the corms with the stakes.
- It takes about 60 days from the time gladioli are planted for the corms to root, grow, bloom.
Care
- Put a 2- to 4-inch layer of mulch around your gladioli to keep your soil moist and help prevent weeds.
- If you get less than 1 inch of rain a week, water your plants regularly throughout the summer. Otherwise, water them moderately when in growth to keep the soil moist.
- Remove the faded/dead flowers to ensure continuous blooms. Once all the flowers on a stalk are gone, cut the stalk off at about 2 to 3 inches above the soil.
- Be sure to leave the plant intact so it can mature and rejuvenate the corms for the next season.
- If you live in Zone 8, put down a layer of hay or straw for winter protection.
- Corms should be dug before the first fall frost if you live in Zone 7 or colder.
Pests/Diseases
- Gladiolus corm rot (Fusarium wilt)
- Gray mold
- Viruses
- Aster yellows
- Spider mites
- Thrips
- Aphids
Harvest/Storage
Cutting Gladiolus Flowers for Bouquets
- Cut the flower stalks early in the morning or at night, not during the heat of day.
- Use a sharp knife and bring a bucket of lukewarm water to the flower bed.
- Cut stalks with only one or two open flowers. The rest of the buds will open after you put them in a vase.
- Cut diagonally through the stalks and place them in the bucket.
- Leave at least four leaves on the plant in the ground if you want to re-use the corms.
- Place the bucket with the flowers in a cool dark place for a few hours before arranging them in a vase.
- Remove lower fading flowers and cut about 1 inch off the bottom of each flower stalk every few days.
Storing Gladioli Corms
In colder regions, dig up gladioli corms once the foliage has faded but before the first fall frost.
- Use a spade and dig up the entire plant, grasping the top to pull it out of the soil. Avoid bruising or injuring corms while digging. Shake off all loose soil and discard damaged corms. Cut the stalk within 1 inch above the corm. Save the small cormels separately if you so desire. These will bloom in 2 to 3 years if you replant them each spring.
- Allow the corms to dry in the sun for 1 or 2 days if the weather agrees. Sift out excess soil and place corms in wooden flats or trays. Cure in a warm and airy location for 2 weeks at a temperature of 80 to 85°F (27 to 29°C). Remove and throw away the oldest bottom corms (from the base of the new one).
- Don’t remove the husks on the corms.
- Dust the corms with a fungicide (“bulb dust”) to avoid disease problems. Place dust and bulbs in a paper bag and shake vigorously.
- Store the corms in paper or cloth bags, pantyhose, or old onion sacks. Stack or hang the containers so air can move among them. Store the corms at 35 to 45°F (2 to 7°C) in low humidity. A cool basement is quite suitable. Do not allow corms to freeze.
- Replant these corms in the spring for another year of beautiful blooms.
- Learn more tips for storing gladiolus through the cold winter.
Recommended Varieties
- ‘Candyman’, for its beautiful deep pink flowers
- ‘Dream’s End’, which makes a good back border plant because its flower spike is up to 3 feet tall (and it has pretty light orange flowers with large yellow centers)
- ‘Prins Claus’, which has white flowers with splashes of pink on its petals
- ‘Black Star’, which has deep purple-red blooms and reaches 36 to 60 inches tall
- Glamini Glads are pest resistant and bloom in full sun or partial shade. Their shorter height is perfect for the middle or front of flower beds.
Wit & Wisdom
- Gladiolus is one of the August birth flowers.
- Gladiolus is sometimes called a Sword Lily due to its sword-shaped leaves.
- In the language of flowers, gladiolus signifies remembrance. Learn more flower meanings!
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Reader Comments
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I live in the very south, my
I live in the very south, my gladiolus stay in ground year round. They now have multiple small shoots around each original plant. Do I need to thin them? The larger plants have beautiful flowers. By late spring the bed looks like it needs mowing.
Gladiolus
I live in southern tip of Texas, zone 9b. I have never grown glads in this kind of climate. It is January 5th and most of my glads still have green leaves. We may not get even a light frost here. Do these need to be cut back before spring growth? Please advise.
Glads in zone 9
Do not cut them back; the flowers bloom on the stems. No stems, no flowers. We are finding sources that assure that glads will thrive in zone 9, perhaps none better than the Galveston County office of Texas A&M’s Agrilife Cooperative Extension. They produced a 100-page booklet and a search for “gladi” in it brings you to Chapter, 5, page 49: https://aggie-horticulture.tamu.edu/galveston/publications/Creating-the-...
We recommend that you reach out to folks there; you can find them here https://www.almanac.com/content/cooperative-extension-services Click on Texas and numerous options come up (we clicked on “AgriExtension” at the top, and in the middle of the page pops up a button for asking questions.
We hope this helps.
gladiola
My tallest glads this year have grown to a height of 7 foot, they had plenty of water in heatwave. and the colours were vibrant. 90 days from planting six inches deep to flowering.
all fed Epsom salts and home made compost.
giant glads!
Seven feet tall?! Were they a particular variety? That is amazing! No doubt your “formula” worked magic on them! Thanks for sharing! Although we can not post pics here, we’d love to seem them on Instagram if you tag TheOldFarmersAlmanac . Cheers!
gladiola
I see the remarks about glads being called the sword lily.
may I add to that, the Romans had a short sword called the gladius. look up wiki.
My gladiolus leaves are 30 to
My gladiolus leaves are 30 to 35 in., no stems yet
And no sign of them either. What would you suggest?
glads
Hello, glads bloom by color, meaning certain colors will bloom first in the garden. August is usually when they start to bloom, and when it happens, it seems to happen v ery quickly. All of a sudden you will notice a flower spike that you hadn't noticed before. They are worth waiting for.
Gladys
My gladiola has two stems on one plant!
Glads
Trying to figure out if all this extra stuff that has came up around my gladiolus is more glads or just grass .
Galdiolu
I haven't grown these before bought a mixed bag is it alright to plant in to fairly deep pots rather than the ground soil and the best compost to use, once planted if I can put in pot do I use a ferterlizer like fish and bone? Jocelyn Leyland
glads in containers
Yes, you can plant gladioli in containers! The shorter varieties work better, so that you won’t have to stake them. Choose a pot at least 12 or 18 inches deep. A good potting mix with loam works well–you can also mix in some compost. You can add in a little bonemeal when mixing up the potting mix, if the potting mix doesn’t already have fertilizer for flowers already in it. Fish meal might have too much nitrogen, which encourages leaf growth over flowering. Hope this helps!
Do deer eat gladiolas?
Not having grown gladiolas before, do I need to plant them somewhere protected from deer, or are they like daffodils that deer don't like? Thank you!
gladiolus deer-resistant?
Gladiolus are somewhat deer-resistant but not as resistant as daffodils. See our list of most deer-resistant plants: https://www.almanac.com/content/deer-resistant-plants
Gladiolus
Very informative. Thanks
Gladioli
Will Gladiolus return the following year if the stems are not cut? My mom died suddenly last year and in my grieving I forgot to cut the stems...
I have always just stuck mine
I have always just stuck mine in the ground and that is all. I have never cut my stalks and mine return each year for about 4 years now
Where do you live?
Where do you live?
I’m in West Texas
My Glads are about 4 yrs. old, they came up this year,but never bloomed
Wondering if I should cut I should leave them alone
Thanks
Gladiolis
Can you tell me if one bulb multiplies? I planted a couple of bulbs and I noticed that I have a lot of extra gladiolis that have come up in my gardeen.
Planting Glads
I live in zone 5 and purchased glad corms from Holland arriving in early November. I thought they should be planted in fall but am now confused after reading this post. Will these corms survive for planting in spring or should I go ahead and plant them? If so, how deep and will covering them with mulch help them survive. Please let me know as soon as possible.
Thank you
planting glads now or in spring
Many summer bulbs such as glads are not “hardy”; they are tender and may not survive a cold/severe/heavy winter. They are usually lifted in autumn and replanted after the last frost. That said, many people report success with gladiolus bulbs that are not lifted, that spend the winter in the ground. According to anecdotal reports, your zone, 5, seems to be the border: zones 6 and up have better luck, zones 4 and below less or none. You should consider your immediate environment—your microclimate. Is your garden protected by fencing or shrubbery, for example? On the south side, getting the most full sun? Those would be conditions favorable to planting now. But if you do, pile on several inches of mulch, too. You need/want to protect the bulb from freezing. Realize, too, that you can only protect from Mother Nature to a limited degree.
If you decide to wait and plant in spring (it gets closer every day!), follow the storage guidance above and plant at the earliest safe opportunity.
We hope this helps!
agriculture
hi iam akhtar research student working on gladiolus the information you people shared are really helpfull thank you all....
Re gladioli
I would like to know when should I reap tje corms from my gladioli plant. It just finished flowering and I hace cut the stalk. I live in the tropics
Color Changed drastically
We had purchased purple, blues, pinks, and yellow glads. However, when they all blossomed they were variant shades between white/pink and solid pink. They were all planted 3-5 inches deep, with all the similiar soil. My original glad that is deep pink with yellow center and edges is normal but all the rest are variants and before it was transplanted from a pot to a garden. Should we pot plant then transplant as a regular rule of thumb? Or will they still drastically alter like ours did?
Gladiolus Color Change
Hi Davis,
Since gladiolus grow from corms, they produce new offsets throughout the growing season. The strongest hybrids will eventually crowd out the original varieties that you planted. The way to avoid this problem is to dig up the corms once every year or two in the fall and separate the new growth offsets. Plant the offset corms elsewhere and see what color blooms they produce the following year; if the blooms are colors that you like, replant the offset corms in your main gladiolus patch. We hope this helps!
Gladioli's
Hi I live in Ocala FL can I grow them in FL
Also I have a summer home in NH and would like to, plant
them here. We come up the first of June and leave the end of Sept. can I plant them the first of June and get blooms. Also if I cover them with hay in the fall before we leave will they come up again next spring.
If so if I plant some now will they be ok for the winter, here in NH
Thank you so much for your info
Jackie
Abt glads
Iam from India I jst saw the glads I loved it and ordered seeds online can u please help me out how n when abt this plants and iam vry new in this planting please help me
Gladioli plantings
Hi, i live in NE GA, where periennels like daffodils, hythanths, gladiolus bulbs will sprout as early as Feb sometimes. therefore, I need to plant the bulbs in the fall -- early or late? Thanks for your help!
planting bulbs
Hi Julie, Plant spring-flowering bulbs in the fall. In Georgia, spring-flowering bulbs can be planted from October through late December in most areas. Hope this helps!
gladiolus
Our gladious are beautiful, issue is they are ovrr 4feet tall, when they bloom I hzve staked but the blooms bend completely over so I have lots of gladious in vases. The other issue I have if the bloomis really tall the top 2 inches bend over
Any input would be appreciated.
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