Illustration
Red Impatiens
Impatiens walleriana
Red Impatiens blooms from May through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Red Impatiens
Plant it in full shade. It prefers high water. Expect it to reach about 12 in tall and 12 in wide at maturity, in roughly 1 year (a house reading).
Pets
- Not yet checked for pets.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
No toxicity note is on file for Red Impatiens. That is not a clearance: check its safety for people and pets before planting.
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 Red Impatiens
Wait until all danger of frost has passed, then plant out Red Impatiens 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 Red Impatiens get?
12 intall5 ft 7 inan adult12 inwideSee Red Impatiens 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 Red Impatiens
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Red Impatiens about 12 in apart, center to center, so each plant has room to reach its full width.
Add Red Impatiens 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
Red Impatiens' height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 7 published sources on October 27, 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 Gardenheight, spread, hardiness zones, sun, water and bloom months and color
- NC State Extensionheight, spread, hardiness zones, sun, bloom months and color and trait tags
- Iowa State University Extensionheight, sun and water
- plantdatabase.kpu.caKwantlen Polytechnic Universityheight, spread and water
- RHSRoyal Horticultural Societyheight
- University of Illinois ExtensionIllinois Extensionsun
- University of Minnesota Extensionsun
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.