Do they need full sun?

No, they prefer partial shade to protect their delicate petals from burning.

Plant guide

Begonia.

Begonia × tuberhybrida

Pronounced beh-GOH-nee-ah too-ber-HY-brih-dah

Also known as Begonia × tuberhybrida, begonia tuberosa hybrids, hybrid tuberous begonia, tuberous begonia

Wax begonia — Photo by Diogo Luiz (CC BY) via iNaturalist

Tuberous begonias are stunning plants known for their large, showy blooms that come in a wide array of vibrant colors. They grow from underground tubers and are often treated as annuals in cooler climates. These beauties really shine in shaded garden spots or hanging baskets.

At a glance

Care level: Moderate
Plant type: Tuberous perennial
Light: Partial shade
Indoor light: bright-indirect
Water: Every 3 to 7 days
Mature size: 30 to 45 cm
Growth rate: medium
Hardiness: USDA 9 to 11
Bloom time: Late spring to early autumn

Care

Keep the soil consistently moist but never soggy to prevent tuber rot. Watch for powdery mildew on the leaves, which often happens if the air circulation is poor. Provide bright, filtered light to encourage the best flowering.

Watering: Water when the top inch of soil feels dry to the touch.
Feeding: Use a balanced liquid fertilizer during the active growing season.
Pruning: Deadhead spent flowers to encourage continuous blooming throughout the season.
Repotting: Repot in fresh soil each spring when starting the tubers from dormancy.
Soil: Well draining, peat based potting mix
Soil pH: Slightly acidic to neutral
Temperature: 15 to 25°C
Humidity: 50 to 70%
Drought tolerance: low
Lifespan: Perennial, typically grown as an annual in cold climates.
Deer and rabbits: moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Water running straight through the pot without soaking in.
The plant stops growing during the active season.

Safety

People: The plant contains soluble calcium oxalates that can cause irritation to the mouth and digestive tract.
Pets: This plant is toxic to cats and dogs if ingested.
Children: Keep this plant out of reach of children as ingestion of the leaves or stems can lead to oral pain and swelling.
Contact allergens: The sap can cause mild skin irritation in sensitive individuals.
Airborne allergens: There are no significant airborne allergens associated with this plant.
Edibility: All parts of this plant are considered toxic if ingested and should not be consumed.

How to identify it

Large, asymmetrical, heart shaped leaves
Showy, often double, rose like flowers
Fleshy, succulent stems
Grows from a rounded tuber

Height: 0.2 to 0.45m
Spread: 0.2 to 0.4m
Leaves: green, deciduous
Flowers: red, pink, yellow, white, orange, 5 to 15cm

Common problems

Powdery mildew — A white fungal growth appears on leaves when air circulation is poor.
Botrytis blight — Gray mold develops on flowers and stems in cool, damp conditions.
Mealybugs — Small white cottony insects suck sap from the stems and leaf axils.

Growing it

Propagation: tuber division, cuttings, seed
When to plant: spring
Overwintering: Lift the tubers after the first frost, clean off the soil, and store them in a cool, dry place in peat moss until spring.
In containers: They are excellent in containers and hanging baskets, needing at least an 8 inch pot for a single tuber.

Tuber Division

Wait until the plant is dormant in late winter.
Cut the tuber into sections, ensuring each piece has at least one eye or bud.
Let the cut surfaces callous over for a few days.
Plant the sections in moist potting mix with the bud facing up.

Group plants with similar shade and water needs to make maintenance easier.

Grows well with

Fuchsia — They share similar requirements for shade and consistent moisture.
Impatiens — These provide a lovely carpet of color beneath the taller begonia stems.
Coleus — The vibrant foliage of coleus contrasts beautifully with the large begonia flowers.

Keep away from

Sunflowers — Sunflowers require full sun and dry conditions that would kill a tuberous begonia.

Similar species

Wax Begonia — These are smaller, fibrous rooted begonias that tolerate more sun than tuberous types.
Rex Begonia — These are grown primarily for their stunning, patterned foliage rather than flowers.

Science

Family: Begoniaceae
Genus: Begonia
Order: Cucurbitales
Class: Magnoliopsida
Native range: The parent species are native to the Andes mountains in South America.
Conservation: This is a man made hybrid and is not a species of conservation concern in the wild.

In their native mountain habitats, they grow in cool, moist, and shaded rocky crevices.

Uses: Container gardening, Hanging baskets, Shady border accent

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 3/9
Temperature: 5/9
Moisture: 6/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Do they need full sun?: No, they prefer partial shade to protect their delicate petals from burning.
How often should I water?: Keep the soil consistently moist but never soggy to prevent tuber rot.

Where the name comes from

The genus honors Michel Begon, a French patron of botany, while tuberhybrida refers to the tuberous root system and hybrid origin.

Good to know

Tuberous begonias are famous for their massive, rose like blooms.
They grow from a thickened underground structure called a tuber.
These plants prefer cooler summer temperatures to thrive.
They were first introduced to Europe in the 1800s.

Is your begonia looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.