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Summer-flowering perennial corms
Iridaceae
White gladiolus with raspberry throats for bouquets
Van Noort
‘Fiorentina’ gladiolus (Gladiolus ‘Fiorentina’)
Fiorentina gladiolus is a tender horticultural cultivar in the Iridaceae family, grown from corms. It reaches about 100 cm and carries upright late-summer spikes covered with large, ruffled snowy-white flowers with raspberry throats with raspberry-to-magenta throats. Narrow green sword-shaped foliage emphasizes its vertical outline. The Van Noort package contains eight corms for planting in full sun and fertile, freely drained soil. It suits borders, large containers, and summer cutting gardens. In Quebec, lift the corms before hard frost, dry them carefully, and store them in a cool, dark, frost-free place until spring planting returns. Its delicate colouring remains clear and attractive under bright summer sunlight throughout the flowering period.
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Discover the plant
Common name‘Fiorentina’ gladiolus
FamilyIridaceae
GenusGladiolus
SpeciesHorticultural hybrid
CultivarFiorentina
TypeSummer-flowering perennial corms
Botanical nameGladiolus ‘Fiorentina’
‘Fiorentina’ gladiolus produces tall spikes of snowy-white flowers marked by a raspberry-to-magenta throat. This crisp contrast emphasizes the gently ruffled petals and creates a luminous effect in borders and bouquets. The Van Noort package contains eight size 12/14 corms. Each plant develops a fan of upright, sword-shaped green leaves and reaches about 100 cm tall with a 10 cm spread. Grown in full sun, ‘Fiorentina’ flowers in late summer and supplies elegant vertical stems that bring rhythm to a border or useful material to a dedicated cutting garden throughout its display.
Plant corms in spring after frost danger has passed and the soil has warmed. Set the flatter side downward and the growing point upward, about 10 cm deep and 10 cm apart. Choose fertile, loose, freely drained soil. Water after planting, then deeply whenever the surface begins to dry, without leaving standing water. To spread flowering, divide the eight corms among two or three plantings about two weeks apart. Add discreet stakes before spikes reach full height when the site is windy, and feed moderately with a bloom-supporting formula instead of promoting excessive foliage. Keep the bed weeded without disturbing shallow feeder roots.
Cut stems when the lowest two buds show colour, retaining several leaves on the plant so the replacement corm can mature. Refresh vase water regularly and remove faded florets. In the garden, combine white blooms and raspberry throats with white cosmos, purple salvias, violet verbenas, and fine ornamental grasses. In cold Canadian climates, this zone 8 gladiolus is grown as a tender annual. After the first frost, lift the corms, allow them to dry, remove loose soil, and store them somewhere cool, dark, dry, airy, and frost-free. Discard soft or spotted specimens before storage and inspect the collection periodically through winter.
In the garden
- Exposure
- Full sun in a warm sheltered position
- Life cycle
- Tender perennial grown as an annual in Quebec
Planting guide
Sowing & germination
Planting depth
About 10 cm
Spacing / density
Space 10 to 15 cm apart
Best planting time
May to June in Quebec, once soil has warmed
Propagation
Corms and separation of cormlets during dormancy
Growing method
Plant all eight corms in spring after frost danger has passed and the soil begins to warm. Choose a position receiving at least six hours of sun and sheltered from prevailing winds. Loosen the soil, incorporate mature compost, and improve drainage wherever water lingers. Set corms pointed end upward about 10 cm deep and 10 cm apart. Water to settle soil around them, then maintain even moisture without saturation. To extend flowering, divide planting into two or three dates spaced two weeks apart. Add discreet support in exposed locations. Remove faded spikes but retain several leaves so reserves return to each corm. After foliage yellows, lift before hard frost, dry and clean the corms, and store them in a cool, dry, dark, frost-free place. Inspect stored corms periodically and discard any that soften or develop mould. During summer, water at soil level in the morning and avoid wetting foliage unnecessarily. Watch for thrips that can scar flowers and remove badly affected tissue promptly. A thin mulch layer suppresses weeds, but keep it away from stem bases. Label the group before the foliage disappears, and clean cutting tools between plants to reduce disease spread during harvest.
Soil and care
Soil & care
Soil pH
Acid, neutral, or alkaline
Minimum temperature
Avoid frost; lift before hard freezes
Care level
Moderate
Watering
After planting, water to settle the soil, then wait for shoots before increasing irrigation. During active growth and flowering, provide approximately 2.5 cm (1 in) of water weekly when rain is absent. Water at soil level in the morning and let the surface drain. Reduce moisture gradually after bloom so corms mature before dormancy. Consistent moisture supports even spikes. Containers may need more frequent checks during hot, windy weather.
Soil type
Choose light, freely drained soil in full sun. Loam, sand, or chalk at any pH is suitable when excess water drains quickly. Avoid cold saturated clay, especially during dormancy. In a borderline climate, the base of a south- or west-facing wall creates a warmer sheltered microclimate and reduces winter moisture around the corms. Add fine gravel where necessary to improve soil structure and protect dormant corms from prolonged winter wetness.
Fertilization
Incorporate mature compost before planting. When shoots reach 10 to 15 cm (4 to 6 in), apply balanced slow-release fertilizer or a half-strength liquid feed. Repeat once as buds begin forming. Avoid excess nitrogen, which promotes foliage and weak stems at the expense of flowers and the corm’s stored energy. Stop feeding after bloom so foliage can mature naturally and corms can enter dormancy with firm, well-ripened tissues.
Moisture
Maintain moderate, even moisture during rooting, active growth, and spike formation. Water deeply when the upper few centimetres of soil become dry, then allow excess water to drain away. Avoid constantly waterlogged ground, which encourages corm rot, and prolonged drought while flowers are developing. Reduce irrigation gradually as foliage yellows so the corms can mature before dormancy, lifting, drying, and frost-free storage.
Seasonal care
In spring, inspect corms and discard any that are soft, mouldy, or badly shrivelled. Prepare a full-sun site enriched with compost and offering excellent drainage. Plant about 10 cm deep and 10 cm apart, then water. During growth, weed carefully, maintain even moisture, and watch for thrips, aphids, and slugs. Apply a moderate dose of balanced fertilizer when shoots reach 10 to 15 cm. Stake only spikes exposed to wind. For bouquets, cut when the two lowest florets show colour while leaving several leaves. Remove faded flowers afterward without stripping green foliage. In fall, reduce irrigation and wait for natural yellowing. Lift corms before hard frost, dry them in an airy location, remove soil and old tissues, and label the cultivar. Store in paper bags or ventilated trays in a cool, dry, dark, frost-free place. Check monthly and discard every softened, spotted, or mouldy corm before spring. In early summer, confirm that the soil still drains freely after heavy rain and gently loosen any crusted surface. Avoid high-nitrogen feeding that creates weak stems. During storage, do not stack corms in thick layers, and maintain steady air circulation. The following spring, plant only firm, healthy corms after the ground has warmed. Separate small cormlets if desired, but expect them to require additional growing seasons before flowering. Choose a clean, ventilated storage shelf.
Container growing
Container growing
Recommended pot size
35 to about 100 cm (14 to 16 in) wide and at least 10 cm (12 in) deep for 8 corms
To grow all eight corms in a container, choose a heavy pot at least 40 cm wide and 35 cm deep with several drainage holes. Use quality potting mix blended with mature compost and coarse perlite. Set corms pointed end upward about 10 cm deep and distribute them evenly. Water after planting, then whenever the surface begins to dry, never allowing water to remain in the saucer. Place the pot in full sun, shelter it from strong gusts, and rotate it to encourage straight growth. Add a discreet circular support before spikes lengthen. Apply a half-strength balanced fertilizer during active growth. Remove faded flowers but allow leaves to yellow, then stop watering. Before frost, move the container into a cool, dry place or lift the corms and store them separately in frost-free conditions. Monitor moisture more closely on hot days because containers dry faster than garden soil. Water slowly until moisture exits the drainage holes, then empty the saucer. Move the pot away from walls that reflect excessive heat and inspect leaves regularly for thrips. During storage, keep the growing medium nearly dry to prevent rot, and ensure that air can circulate around the pot or lifted corms.
Bloom and dimensions
Size, flowering & harvest
Mature height
100 cm (40 in)
Width / spread
10 cm (4 in)
Flower color
Snowy white with a raspberry-to-magenta throat
Foliage color
Green
Foliage type
Deciduous, narrow, upright, and sword-shaped
Growth rate
Moderate
Growth habit
Upright, columnar, and clump-forming
Fragrance
Light or absent; grown primarily for colour
Bloom period
In late summer, upright spikes carry many large, ruffled, funnel-shaped flowers in snowy white with a raspberry throat with raspberry-to-magenta throats. Florets open gradually from bottom to top. Green sword-shaped foliage reinforces the vertical silhouette. Cut several spikes when the first buds show colour, or leave them to animate a sunny border, large container, cutting garden, and romantic summer planting. Their succession maintains a delicate display for several weeks.
Harvest
Approximately 80 to 100 days after planting. Harvest the flower stalks for bouquets when the first flowers begin to open.
Garden associations
Companion plants & uses
Companion plants
Choose dahlias, compact cannas, salvias, verbenas, cosmos, zinnias, and fine grasses that share a preference for sun, warmth, and draining soil. Purple or bronze foliage echoes the dark flower throat, while blue blooms provide a cool contrast. Avoid bog plants and dense groundcovers that trap moisture around corms or complicate cormlet division. Yarrows and bearded irises extend the early-summer display around the spikes. Leave open soil around each cluster so lifting tools can enter without damaging neighbouring crowns, and maintain clear airflow during humid weather.
Garden use
Plant all 8 corms as a group in a sunny border, warm-toned garden, colour garden, or large container. Their vertical outline fits between broader perennials and extends bloom into late summer. Spikes are excellent for bouquets and continue opening buds in a vase. Position another group near a patio to enjoy the evening colour while keeping the toxic plant beyond the reach of pets. In colder regions, start corms in pots to ensure flowering before frost. Their colour is most rewarding where people pass during late afternoon and evening.
Frequently asked questions
Frequently asked questions
How should the eight Fiorentina corms be planted?
Plant in spring after frost danger has passed and the soil has warmed. Sort the eight corms and retain firm specimens. Set the flatter side downward and the point upward about 10 cm deep, leaving 10 cm between plants. Choose full sun and fertile, loose, freely drained soil. Water after planting to settle soil around the corms, but prevent saturation. Mark the row and install supports early when the site is windy. A second planting two weeks later usefully extends the late-summer flowering period. Keep the area weeded without damaging emerging shoots or shallow feeder roots. Keep the row clearly labelled and free of weeds.
What colour does Fiorentina actually produce?
‘Fiorentina’ opens predominantly snowy-white flowers marked by a raspberry-to-magenta throat that creates crisp central contrast. Marking intensity may vary slightly with light, temperature, flower age, and growing conditions. Ruffled petals reflect light strongly, while the coloured centre remains visible both close up and in bouquets. Pair this palette with violet, burgundy, cool pink, or dark foliage to echo the throat without competing with the white petals. Avoid describing the cultivar as entirely pink or purple: its identity depends on a white ground and a clearly defined raspberry accent in every well-formed spike. The contrast remains clearly visible from a distance and in mixed arrangements.
How can straight, sturdy spikes be encouraged?
Set corms at the recommended 10 cm depth in firm but drained soil because this foundation helps roots anchor the stems. Choose full sun, since excessive shade encourages weak, leaning spikes. Install stakes or support netting before buds become heavy, especially in windy locations. Water deeply instead of shallowly and avoid excessive nitrogen that produces soft tissues. Group several plants so they shelter one another slightly while preserving 10 cm spacing and good airflow. Rotate containers periodically so stems do not all lean toward the light, and inspect ties as spikes expand to ensure supports never constrict or bruise them.
When should Fiorentina be cut for a bouquet?
Cut early in the morning when the lowest two buds show colour and begin opening while upper buds remain firm. Use a clean knife or pruner and leave at least four leaves on the plant to feed the replacement corm. Place the stem immediately in fresh water, recut it at an angle, and remove only foliage that would sit below the waterline. In the vase, refresh water often and remove faded florets as they decline. Keep the arrangement away from direct sun, heat, and ripening fruit to prolong the spike’s gradual opening and preserve the crisp white petals and raspberry markings.
How should the corms be stored through winter?
After the first frost, cut stems while retaining a short section and lift the corms without injuring them. Shake away soil, label ‘Fiorentina’ immediately, and let the clusters dry in sheltered airflow. Once tissues are dry, detach the shrivelled old corm and small cormels, then discard soft, spotted, or foul-smelling specimens. Store sound corms in one layer or breathable paper bags somewhere cool, dry, dark, and frost-free. Inspect them several times through winter and remove any deteriorating piece to protect the remainder. Replant only firm, healthy corms after spring soil warms and frost danger has passed. Keep every stored batch dry and correctly labelled.
Wildlife and pets
Wildlife & precautions
Attracts birds
Yes
Reported toxicity
Yes
Supporting wildlife
Star-shaped flowers may attract daytime butterflies and some long-tongued pollinators, while evening colour signals blooms to insects active near dusk. This contribution is complementary within a diverse garden. Avoid insecticides, retain several uncut spikes, and grow nearby nectar plants with more accessible flowers to support a broader range of visitors.
Outils
Compostage et écologie
