Illustration
Diamond Spire Gardenia
Gardenia 'Leefive'
Diamond Spire Gardenia blooms from May through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Diamond Spire Gardenia
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 7–10. Expect it to reach about 3.5 ft tall and 1.5 ft wide at maturity, in roughly 4 years (a house reading).
Is Diamond Spire Gardenia toxic to dogs or cats?
- Listed as toxic to dogs and cats by NC State Extension.
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 Diamond Spire Gardenia
Plant Diamond Spire Gardenia in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 8, the middle of its hardy zones 7 to 10, spring means February to April and fall means September or October. Once settled, it blooms from May to June.
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 February. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Diamond Spire Gardenia get?
3.5 fttall5 ft 7 inan adult1.5 ftwideSee Diamond Spire Gardenia in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Diamond Spire Gardenia
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Diamond Spire Gardenia about 1.5 ft apart, center to center, so each plant has room to reach its full width.
Add Diamond Spire Gardenia to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Diamond Spire Gardenia's height, spread, hardiness zones, sun, water, bloom color and trait tags were checked against 8 published sources on October 20, 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.
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- Plant Addictsheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- wilsonbrosgardens.comWilson Bros Gardensheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- myperfectplants.comPerfect Plantsheight, spread, hardiness zones, sun, water and bloom months and color
- Sooner Plant Farmheight, spread, hardiness zones, sun and bloom months and color
- southernlivingplants.comSouthern Living Plant Collectionheight, spread, hardiness zones, water and bloom months and color
- kingsgardencenter.comKing's Garden Centerheight, spread, hardiness zones and water
- swiftcreeknursery.comSwift Creek Nurseryheight, spread, hardiness zones and water
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Diamond Spire Gardenia
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses, but only mildly: eating it typically causes mild vomiting or diarrhea, sometimes hives. The toxins are geniposide and gardenoside. per ASPCA and NC State
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Design 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.