Gladiolus is a perennial grown for its root. Its summer flowers are a moderate draw for honeybees, native bees, and butterflies, even though the root is the prize.
Zones
Data not available
pH Range
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Sun
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Days to Maturity
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What Gladiolus is
Gladiolus grows as a perennial and reaches around four feet at maturity. It blooms in summer.
How to grow Gladiolus
USDA Zones
Data not available
USDA PHZM 2023
Soil pH
Data pending
USDA PLANTS Database
Sun
Data pending
plant_species_v5.csv
Drainage
Data pending
plant_species_v5.csv
Mature Height
4 ft
plant_species_v5.csv
Sow directly
Sow gladiolus seed straight into the bed — root crops germinate fast and resent transplanting. Give them full sun.
Match the soil
Pull a soil test from your local Extension lab to confirm pH and drainage match gladiolus's needs before planting.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at maturity
Pull while roots are young and tender — sweeter than oversized ones. Local Cooperative Extension guides publish timing tables.
Good to know
Good news for pet owners — gladiolus isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Gladiolus offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Gladiolus thrives
Whether gladiolus thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Gladiolus will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether gladiolus actually takes — we score it against the real conditions at your address.
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Frequently Asked Questions
Can I grow Gladiolus in my zone?
Zone data for gladiolus is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Gladiolus?
Most growers plant gladiolus after the last spring frost, once the soil has warmed. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
What soil does Gladiolus need?
Specific pH data for gladiolus is pending. A soil test from your local Extension lab confirms what your site needs.
Does Gladiolus attract pollinators?
Yes — gladiolus's flowers are a solid nectar source for honeybees, native bees, and butterflies (Xerces Society, Pollinator Partnership).
Is Gladiolus safe for pets?
Gladiolus is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.