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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 and large, colorful blooms. A great cutting flower, gladioli look spectacular in summer bouquets. Here’s how to grow gladioli in your garden.
Commonly called “glads,” these lovely flowering plants are available in a multitude of colors and typically reach between 2 and 5 feet in height. Their blooms also range in size—from “miniature” flowers less than 3 inches in diameter, to “giant” flowers greater than 5 inches across!
The taller varieties, which need to be staked, are often placed in the back of a garden to nicely complement shorter plants.
Note: In Zone 7 and colder, gladioli corms will likely need to be dug up in the fall, stored, and replanted the following spring. Find your planting zone here and see instructions for this process below.
Planting
When to Plant Gladiolus
- Start planting gladiolus corms in the spring, once the danger of frost has passed and the soil has warmed to at least 55°F (13°C). See your local frost dates here.
- From your last frost date to early summer, plant another round of corms every 10 days or so. This will result in continuous blooms through early fall!
- Depending on the variety, it takes between 60 and 90 days from the time glads are planted for the corms to root, grow, and bloom.
Choosing and Preparing a Planting Site
- For the best flowers, plant glads in full sun.
- Gladioli like well-drained soil that’s moderately fertile. They will not do well in heavy, soggy soil.
- 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.
How to Plant Gladiolus
- 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.
- If you 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 beds, plant the corms in groups of 7 or more for the best effect.
- Water the corms thoroughly at planting.
- If you’re planting tall varieties, be sure to stake them at planting time. Be careful not to damage the corms with the stakes.
Care
How to Grow Gladiolus
- 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 grow the corms for the next season.
Winter Protection for Gladiolus
- 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 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.
- Gladioli are sometimes called “sword lilies” due to their blade-like leaves. In fact, “gladiolus” itself comes from Latin gladius, meaning “sword.”
- In the language of flowers, gladiolus signifies remembrance. Learn more flower meanings!
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Reader Comments
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Eaten Sprouts.
My little sister's dogs ate the tops of my recently sprouted Vista gladiolus and my recently planted rose bush. Is there any chance of them re-growing in a few weeks, or are they goners?
Sprouted Gladiolus
Hi James,
There’s a chance they will grow back in, but it depends on how bad the damage is!
first frost coming... still flowers blooming
I live in Canada and we are forecast to have our first snowfall, with temperatures at well below freezing for a few days. I still have several glads that are about to put forth flowers. Should I cut all flower stems and then dig up my bulbs despite the fact the plant has not "died off"? Thanks for any info
Awesome
These are really pretty interesting in taking care of gladiolus. Thanks for sharing your insights and tips.
Neon Green Glad's!
I dug up some of my Mom's Glad's when we had to sell the home after my dad's passing & my mom was put into a Memory Care Home. So far I have Purple, Pink, & Neon Green Flowers. Not Yellow! Nowhere have I ever seen the Green Glad's nor has anyone I know. My Mom's are the only ones! Is this unusual?
after the first year my glads
after the first year my glads just grow good green leaves? no flowers. i do not dig them up each year is that a problem?
Gladiolus leaves but no flowers
Usually, the reason you get leaves without flowers is because 1. bulbs have been overfed with with a nitrogen fertilizer (or lawn fertilizer) which encourages leaf production sometimes at the expense of flowers, or 2. bulbs are planted in too shady or wet of an area. Most bulbs need at least 6 to 8 hours of sun and soil that drains well.
Another possible reason is that the bulbs leaves were cut too soon the previous year. Bulbs need the leaves even if the blooms are done. The leaves collect nutrients for next year. Once the leaves yellow, they may be removed.
Finally: If you have been growing these bulbs in the same area for many years, they may need to be divided. Bulbs can be dug and divided once the leaves yellow this spring. Replant soon after digging. No need to wait until fall to replant.
cladiolias
I planted glads and spikes came out but got broken off by watering it
will it still grow
Zones
Why can't I find a map showing the zones you are talking about? I am not sure which "zone" I live in.
USDA Zones
The zones in question are those defined by the USDA. Find a map here: https://planthardiness.ars.usda.gov/
Gladiolus
I received a stem of gladiolus with my Mother's Day bouquet of flowers and would like to plant it, how do I do that? Is there anything to need to do to prepare if for the dirt or do I just put it in dirt. I'm not good with flowers of any kind at all, but these are so beautiful I would like to keep it growing.
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!
7’ gladiolus
Hi. First of all congratulations on your 7’ glads !! I am utterly in awe & would love to see pics if u could show me these beautiful flowers uv grown!! I must learn your secrets to grow them here for my mother!! I live in Central TX out in the country & my mother’s fav flower is gladiolus. I have tried to grow them 3 years in a row with poor outcome!! this year will be the first year I have been able to actually cut a flower for the table, I have planted hundreds of bulbs!! I have used a variety of planting spots to see what if any area is best. I have tried full sun part sun ground soil potting soil and miracle grow food I have tried potting the.bulbs as well! I’m so frustrated that out of so many bags of bulbs i have only produced one beautiful red gladiolus that was breathtaking... the rest are either of poor health dismal color or get eaten.by our annoying grasshoppers before I ever see color bloom!!! Some are curled when they come out of the stalk and don’t look good at all & others the flower itself dies before ever blooming!! This is exasperating as I want so badly to produce multitudes of fresh flowers daily or weekly at least for my 80 yr old mother!! I feel like she may pass away before I ever get to spoil her with bouquets of fresh gladiolus on our table!! Please help! Thank you!
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.
Glads in Summer!
I transplanted my Glad's when we moved in Sept. or Oct. 2018. By March 2019 they were already starting to bloom & all were finished well before Summer. I live in Houston, TX. & they are under a small Japanese Maple, yet get lots of Sun. I need to find out when to plant more Corms to get them to bloom all Summer!
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
gladious
i live in mass. and yes those darn deer do eat them, even with a fence.
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...
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