Illustration
McKay's White
Potentilla fruticosa 'McKay's White'
McKay's White blooms from June through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing McKay's White
Plant it in full sun. It prefers low water. It is hardy in USDA zones 2–7. Expect it to reach about 2.5 ft tall and 3.5 ft wide at maturity, in roughly 3 years (not yet checked).
No toxicity note is on file for McKay's White. 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 McKay's White
Plant McKay's White 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 5, the middle of its hardy zones 2 to 7, spring means April to June and fall means August or September. Once settled, it blooms from June to September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does McKay's White get?
2.5 fttall5 ft 7 inan adult3.5 ftwideSee McKay's White 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 McKay's White
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space McKay's White about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add McKay's White 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
McKay's White's height, spread, hardiness zones, sun and trait tags were checked against 10 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.
- plantsomethingmontana.orgPlant Something Montanaheight, spread, hardiness zones, sun and trait tags
- ricksgarden.comRicks Garden Centerheight, spread, hardiness zones, sun and trait tags
- Plant Addictsheight, spread, hardiness zones and sun
- The Morton Arboretumheight, spread, hardiness zones and sun
- treestodaynursery.comTrees Today Nursery (data credited to Bailey Nurseries)height, spread, hardiness zones and sun
- bhfnursery.comBlue Heron Farm Nurseryheight, spread and hardiness zones
- diggingdog.comDigging Dog Nurseryheight, spread and hardiness zones
- NC State ExtensionPlant Toolboxhardiness zones, sun and trait tags
- pinelanenursery.comPine Lane Nurseryheight, spread and hardiness zones
- Oregon State UniversityLandscape Plantshardiness zones and sun
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.