Illustration
Phenomenal
Lavandula × intermedia 'Phenomenal'
Phenomenal blooms from June through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Phenomenal
Plant it in full sun. It prefers low water. It is hardy in USDA zones 5–9. Expect it to reach about 2.5 ft tall and 2.5 ft wide at maturity, in roughly 2 years (not yet checked).
What was checked
Mature height and spread, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not, and each fact above says which. 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 Phenomenal
Plant Phenomenal 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. Once settled, it blooms from June to August.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 7, the middle of this plant's hardy range, start with zone 7 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Phenomenal get?
2.5 fttall5 ft 7 inan adult2.5 ftwideSee Phenomenal 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 Phenomenal
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Phenomenal about 2.5 ft apart, center to center, so each plant has room to reach its full width.
Add Phenomenal 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
Phenomenal's height, spread, hardiness zones, sun and trait tags were checked against 6 published sources on July 29, 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.
- High Country Gardensheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun and trait tags
- Proven Winnersheight, spread, hardiness zones, sun and trait tags
- saundersbrothers.comSaunders Brothersheight, spread, hardiness zones, sun and trait tags
- Walters Gardensheight, spread, hardiness zones, sun and trait tags
- NC State Extensionspecies page, Lavandula x intermediahardiness zones, sun and trait tags
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Phenomenal
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
On the ASPCA toxic list for dogs, cats and horses, though NC State rates severity Low; signs are nausea, vomiting and loss of appetite. Concentrated oil is worse. 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.