Illustration
Firefly Peach Sky
Achillea 'Firefly Peach Sky'
Also called firefly peach sky yarrow
Firefly Peach Sky blooms from June through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Firefly Peach Sky
Plant it in full sun. It prefers low water. It is hardy in USDA zones 3–8. Expect it to reach about 3 ft tall and 2 ft wide at maturity, in roughly 2 years (a house reading).
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. 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 Firefly Peach Sky
Plant Firefly Peach Sky 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 3 to 8, spring means April to June and fall means August or September. 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 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 Firefly Peach Sky get?
3 fttall5 ft 7 inan adult2 ftwideSee Firefly Peach Sky 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 Firefly Peach Sky
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Firefly Peach Sky about 2 ft apart, center to center, so each plant has room to reach its full width.
Add Firefly Peach Sky 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
Firefly Peach Sky's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 9 published sources on September 26, 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.
- Walters Gardensthe breeder and introducer; its variety page for 'Firefly Peach Sky'height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- whiteflowerfarm.comWhite Flower Farm (a Connecticut mail-order nursery that sells the pla...height, spread, hardiness zones, sun, bloom months and color, trait tags, soil and diseases
- Plant Addictsa nursery that sells the plant; the store this queue came fromheight, spread, sun, water, bloom months and color, trait tags and soil
- usperennials.comUS Perennials (a Bloomington, Indiana nursery that sells the plant)height, hardiness zones, sun, water, bloom months and color, soil and pests
- Chicago Botanic Gardenarchived copy, captured before February 2022hardiness zones, sun, water, bloom months and color, trait tags and pests
- US plant patent (Google Patents)US Plant Patent PP32,404 (Walters Gardens, inventor Hans A. Hansen), o...height, spread, hardiness zones, bloom months and color, trait tags and diseases
- NC State ExtensionAchillea millefolium, SPECIES page; already cited under carehardiness zones, diseases and toxicity
- pridescorner.comPrides Corner Farms (a Connecticut wholesale grower that sells the pla...water and trait tags
- ASPCAAchillea millefolium; species leveltoxicity
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Firefly Peach Sky
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
The ASPCA lists yarrow as toxic to dogs, cats and horses. Eating it causes vomiting, diarrhea, colic and drooling, an upset stomach rather than organ failure. per ASPCA
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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.