Illustration
Barbara Mitchell Daylily
Hemerocallis 'Barbara Mitchell'
Barbara Mitchell Daylily blooms from July through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Barbara Mitchell Daylily
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–9. Expect it to reach about 20 in tall and 24 in wide at maturity, in roughly 2 years (a house reading).
Is Barbara Mitchell Daylily toxic to dogs or cats?
- Listed as toxic to dogs by University of Florida IFAS Extension. Another source we check lists it as non-toxic; where sources disagree, the warning is shown.
- Listed as toxic to cats by NC State Extension, University of Florida IFAS Extension, Pet Poison Helpline and Royal Horticultural Society.
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
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 Barbara Mitchell Daylily
Plant Barbara Mitchell Daylily 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 6, the middle of its hardy zones 3 to 9, spring means March to May and fall means August or September. Once settled, it blooms from July to September.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Barbara Mitchell Daylily get?
20 intall5 ft 7 inan adult24 inwideSee Barbara Mitchell Daylily 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 Barbara Mitchell Daylily
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Barbara Mitchell Daylily about 24 in apart, center to center, so each plant has room to reach its full width.
Add Barbara Mitchell Daylily 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
Barbara Mitchell Daylily's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 11 published sources on October 5, 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.
- Plant Addictsthe store this queue came fromheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- RHSRoyal Horticultural Society Find a Plantheight, spread, sun, water, bloom months and color, soil, diseases, pests and toxicity
- plants.chaletnursery.comNetPS Plant Finder entry 4675, as published by Chalet Nursery (Wilmett...height, spread, hardiness zones, sun, water, bloom months and color, trait tags and diseases
- plantsearch.extension.umn.eduUniversity of Minnesota Extension, Plant Elements of Designheight, spread, hardiness zones, sun, water, bloom months and color, soil and pests
- pw.waltersgardens.comWalters Gardens, Inc. (wholesale grower; Zeeland, Michigan), its varie...height, spread, hardiness zones, sun, water, bloom months and color, soil and pests
- pepiniere.caPépinière.ca (a Canadian online nursery)height, spread, hardiness zones, sun, water, bloom months and color and toxicity
- pridescorner.comPrides Corner Farms (wholesale grower; Lebanon, Connecticut)height, spread, hardiness zones, sun, water, bloom months and color and diseases
- oakesdaylilies.comOakes Daylilies (daylily nursery; Corryton, East Tennessee)height, hardiness zones, sun, bloom months and color, trait tags and soil
- daylilies.orgAmerican Hemerocallis Society Daylily Database (the cultivar registrat...height, bloom months and color and trait tags
- NC State Extensionthe GENUS pagesoil, diseases, pests and toxicity
- ASPCAAnimal Poison Control Centertoxicity
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Barbara Mitchell Daylily
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Highly toxic to cats: any part, even the pollen, can cause fatal acute kidney failure, the same effect true lilies have. 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.