Can I grow this in a pot?

Yes, but you need a very large container to accommodate the large tuber growth.

Harvest when the foliage begins to yellow and die back in late autumn.

Plant guide

Yam.

Dioscorea alata

Pronounced dy-oh-skor-EE-uh uh-LAY-tuh

Also known as Greater Yams, Guyana arrowroot, Water Yam, Winged Yam, Yams, greater yam, ten-months yam

Purple yam — Photo by Greg III Espera (CC BY) via iNaturalist

The yam is a vigorous climbing vine grown primarily for its large, edible starchy tubers. It thrives in tropical climates and needs plenty of space for its stems to climb. You'll find it's a staple food source in many parts of the world.

Another photo of Yam — Photo by Bella Lin (CC BY) via iNaturalist

At a glance

Care level: Moderate
Plant type: Tuberous perennial vine
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every 2 to 4 days
Mature size: 3 to 10 meters
Growth rate: Fast
Hardiness: USDA 9 to 12
Bloom time: Mid to late summer

Care

Provide a sturdy trellis for the vines to climb as they grow rapidly during the season. Keep the soil consistently moist but not waterlogged to prevent tuber rot. Watch for yellowing leaves which can indicate poor drainage or nutrient issues.

Watering: Keep the soil evenly moist throughout the growing season.
Feeding: Apply a balanced fertilizer monthly during the active growing phase.
Pruning: Trim back dead or damaged vines to encourage healthy growth.
Repotting: Repot or replant tubers annually at the start of the new growing season.
Soil: Well draining, fertile, loamy soil
Soil pH: 5.5 to 6.5
Temperature: 15 to 35°C
Humidity: 60 to 90%
Drought tolerance: Low
Lifespan: Perennial, typically grown as an annual crop
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes
Stunted growth despite regular feeding

Safety

People: Raw tubers contain substances that can cause irritation and are considered toxic if not properly prepared.
Children: Keep tubers out of reach of children, as raw ingestion can cause severe mouth and throat irritation.
Contact allergens: Handling raw tubers can cause skin irritation due to the presence of calcium oxalate raphides.
Airborne allergens: There are no significant reports of respiratory allergies associated with this plant.
Edibility: The tubers must be cooked thoroughly before consumption to neutralize calcium oxalate crystals and other compounds.

How to identify it

Heart shaped, opposite leaves
Square, winged stems
Large, underground starchy tubers
Small, inconspicuous flowers
Vining growth habit

Height: 3 to 10m
Spread: 0.5 to 2m
Leaves: green, deciduous
Flowers: white, yellow, 0.5 to 1cm
Fruit: brown, Late autumn to winter

Problems to watch for

Scale InsectsCommon
Yam Mosaic VirusCommon
AnthracnoseUncommon
AphidsUncommon
Root RotUncommon
Tuber RotUncommon

By symptom

Plant problems by symptom

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Growing it

Propagation: tuber division, bulbils
When to plant: Spring
Overwintering: In cooler climates, dig up the tubers when the foliage dies back and before the first frost, then store them in a dry, dark, well ventilated place at about 15 to 20°C until spring.
In containers: It can be grown in large containers of at least 20 liters, provided you have a tall trellis for the vines.

Tuber division

1. Cut a healthy tuber into sections, ensuring each piece has at least one bud or eye.
2. Allow the cut surfaces to dry for a day to prevent rot.
3. Plant the sections in well draining soil about 10 cm deep.

Use tall, sturdy plants as living trellises to save space and provide support for the vigorous vines.

Grows well with

Corn · Provides a natural trellis for the yam vines to climb.
Beans · Fixes nitrogen in the soil to support the heavy feeding yam.

Similar species

White Yam · A closely related species also grown for its edible tubers.

Science

Family: Dioscoreaceae
Genus: Dioscorea
Order: Dioscoreales
Class: Liliopsida
Native range: Tropical Southeast Asia
Conservation: This species is widely cultivated and not currently of conservation concern.

It thrives in warm, humid tropical environments and climbs using twining stems to reach sunlight.

Value to wildlife: nectar source
Pollinators: bees, beetles
Uses: food crop, ornamental vine

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 8/9
Moisture: 6/9
Nutrients: 7/9

Taxonomy resolved against GBIF.

Questions people ask

Can I grow this in a pot?: Yes, but you need a very large container to accommodate the large tuber growth.
When do I harvest?: Harvest when the foliage begins to yellow and die back in late autumn.

Where the name comes from

The genus name honors the ancient Greek physician Dioscorides, while the species name alata refers to the winged stems.

Good to know

It is also known as the greater yam or purple yam.
The plant produces aerial tubers called bulbils that can also be used for propagation.
It is a significant crop in the Philippines where it is called ube.
The vines can grow quite long, often requiring sturdy trellising.

Keep your yam growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.