Illustration
White Mexican Heather
Cuphea hyssopifolia
White Mexican Heather blooms from May through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing White Mexican Heather
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 8–11. Expect it to reach about 12 in tall and 16 in wide at maturity, in roughly 1 year (not yet checked).
No toxicity note is on file for White Mexican Heather. That is not a clearance: check its safety for people and pets before planting.
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 White Mexican Heather
Wait until all danger of frost has passed, then plant out White Mexican Heather into warm soil; in most zones that means late spring. Planted then, it flowers from May to October.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 9, the middle of this plant's hardy range, start with zone 9 in February. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does White Mexican Heather get?
12 intall5 ft 7 inan adult16 inwideSee White Mexican Heather 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 White Mexican Heather
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space White Mexican Heather about 16 in apart, center to center, so each plant has room to reach its full width.
Add White Mexican Heather 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
White Mexican Heather'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.
- depts.ttu.eduTexas Tech University Plant Database (Herbaceous Plant Finder)height, spread, hardiness zones, sun and trait tags
- ffl-apps.ifas.ufl.eduUF/IFAS Florida-Friendly Landscaping Florida Bee Gardensheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun and trait tags
- NC State ExtensionGardener Plant Toolboxheight, spread, hardiness zones, sun and trait tags
- University of Florida IFASUF/IFAS Extension Charlotte Countyheight, spread, sun and trait tags
- Clemson Home and Garden Information CenterClemson Cooperative Extension HGICheight, sun and trait tags
How the checking works, and what each standard covers, is on the verified plants page.
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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.