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Yacon

Smallanthus sonchifolius

Also listed as Polymnia sonchifolia, Polymnia edulis

herbaceous☀️ full sun💧💧 moderate water❄ Hardy: Zone 8a – Zone 11b

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A South American perennial herb grown for its edible, crisp tubers with a sweet, apple-like flavor. Dies back seasonally and produces tuberous roots that can be harvested in autumn.

Why grow it

Yacon offers a winter root crop option in zones where sweet potato or Jerusalem artichoke might not thrive, with the advantage of less starch and a crisper texture than either. The plant tolerates partial shade better than most root crops and produces edible tubers without requiring the long, hot growing season that potato or yam demand. Its perennial root system can persist through mild winters in favorable climates, reducing replanting labor.

Watch out for

Tuber quality and yield depend strongly on adequate moisture during the growing season, so consistent watering is necessary in drier climates. The plant's preference for cooler fall conditions means that in very hot regions, harvest timing becomes critical to achieve good sweetness and texture. Rodents may damage stored tubers, requiring proper post-harvest storage management.

Overview

Form
Upright
Growth Rate
moderate
Size
4–8′ tall × 2–3′ wide
Dormancy
deciduous
Family
Asteraceae
EdibleDynamic accumulator

Native Range

Andes Mountains, South America

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Harvest Season

J
F
M
A
M
J
J
A
S
O
N
D

Edible Parts

root

Season of Interest

Fall

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Companion Planting

Plants well with