Illustration
Green Star
Gladiolus 'Green Star'
Green Star blooms from July through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Green Star
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 7–10. Expect it to reach about 4 ft tall and 0.5 ft wide at maturity, in roughly 1 year (a house reading).
Is Green Star toxic to dogs or cats?
- Listed as toxic to dogs and cats by NC State Extension and Pet Poison Helpline.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Green Star
Green Star is a summer bulb planted in spring: get it in after the last frost, once the soil has warmed, March or April in zone 8, the middle of its hardy zones 7 to 10. It is hardy in zones 7 to 10, where it can stay in the ground over winter; colder than zone 7, lift and store it before the ground freezes. Expect flowers from July to August.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 8, the middle of this plant's hardy range, start with zone 8 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Green Star get?
4 fttall5 ft 7 inan adult0.5 ftwideSee Green Star in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
Where these facts come from
Green Star's height, spread, hardiness zones, sun, water, bloom color and trait tags were checked against 8 published sources on October 22, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- American Meadowsheight, hardiness zones, sun, bloom months and color and trait tags
- Brent and Becky's BulbsBrent & Becky's Bulbsheight, hardiness zones, sun and bloom months and color
- dutchbulbs.comK. van Bourgondienheight, hardiness zones, bloom months and color and trait tags
- hardingandbloom.co.ukHarding & Bloomheight, spread, sun and water
- pheasantacreplants.co.ukPheasant Acre Plantsheight, sun and bloom months and color
- RHSRoyal Horticultural Societyheight, sun and bloom months and color
- jparkers.comJ. Parker Dutch Bulbs (Ireland)height and spread
- NC State Extensionsun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Green Star
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses; the toxins concentrate in the corm. Eating it usually causes drooling, vomiting, lethargy and diarrhea. per ASPCA
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FoliageDesign a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.