Illustration
Yellow Calendula
Calendula officinalis
Yellow Calendula blooms from May through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Yellow Calendula
Plant it in full sun. It prefers moderate water. Expect it to reach about 20 in tall and 16 in wide at maturity, in roughly 1 year (a house reading).
Is Yellow Calendula toxic to dogs or cats?
- Listed as non-toxic to dogs and cats by NC State Extension.
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
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. 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 Yellow Calendula
Wait until all danger of frost has passed, then plant out Yellow Calendula 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. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Yellow Calendula get?
20 intall5 ft 7 inan adult16 inwideSee Yellow Calendula 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 Yellow Calendula
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Yellow Calendula about 16 in apart, center to center, so each plant has room to reach its full width.
Add Yellow Calendula 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
Yellow Calendula's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 7 published sources on October 24, 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.
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- NC State ExtensionGardener Plant Toolboxheight, spread, hardiness zones, sun and trait tags
- ag.purdue.eduPurdue University Extensionheight, sun and bloom months and color
- extension.unh.eduUniversity of New Hampshire Extensionheight, sun and water
- extension.colostate.eduColorado State University Extensionbloom months and color
- University of Wisconsin HorticultureUniversity of Wisconsin-Madison Division of Extensionwater and trait tags
- Utah State University Extensionheight
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.