Illustration
Red Kiss Rex Begonia
Begonia rex 'Red Kiss'
Red Kiss Rex Begonia is grown for its foliage rather than flowers, giving the garden structure and color all season long.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Red Kiss Rex Begonia
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 10–11. Expect it to reach about 12 in tall and 12 in wide at maturity, in roughly 1 year (not yet checked).
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 Red Kiss Rex Begonia
Wait until all danger of frost has passed, then plant out Red Kiss Rex Begonia into warm soil; in most zones that means late spring.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 10, the middle of this plant's hardy range, start with zone 10 in January. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Red Kiss Rex Begonia get?
12 intall5 ft 7 inan adult12 inwideSee Red Kiss Rex Begonia 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 Kiss Rex Begonia
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Red Kiss Rex Begonia about 12 in apart, center to center, so each plant has room to reach its full width.
Add Red Kiss Rex Begonia 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 Kiss Rex Begonia's height, hardiness zones and sun were checked against 5 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.
- joshsfrogs.comJosh's Frogsheight, hardiness zones and sun
- logees.comLogee's Plantsheight, hardiness zones and sun
- Missouri Botanical Gardenhardiness zones and sun
- NC State ExtensionPlant Toolboxhardiness zones and sun
- bulkplantdepot.comBulk Plant Depotsun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Red Kiss Rex Begonia
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses via soluble calcium oxalates, most concentrated in the underground rhizome. Causes mouth irritation, drooling and vomiting; kidney failure in grazing horses. per ASPCA and NC State
Explore similar plants
You might also like
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.