Root layer · Andean root crop
Yacon
Smallanthus sonchifolius
A tall Andean root crop with crisp, sweet storage roots. Suits temperate NZ gardens with a long enough season to fill tubers before frost.
Also known as: Yacon
Layer
Root layer
Climate
Warm temperate, Temperate
Sun
Full sun.
Water
Steady moisture through summer growth.
Soil
Deep fertile free-draining soil.
Size
1.5–2.5 m H · 0.8–1.2 m W
Growth
Fast in warm seasons
Frost
Foliage frost tender; lift storage roots before hard frost.
Edible uses
Storage roots (fresh/crisp), Yield crowns saved for replanting
Harvest window
Late autumn before hard frost
Ecological functions
Seasonal biomass · Root layer
Wildlife value
Tall seasonal cover
Human uses
Fresh sweet roots · Stored snack kai
Propagation
Crown offsets / rhizome pieces — not the sweet storage roots used for eating.
Maintenance
Plant after frost; stake if windy; lift before hard frost; separate crowns for next year.
NZ growing notes
Works in many temperate gardens with a decent summer. Early frost shortens the filling period.
In the food forest
Yacon is a tall root-layer plant for sunny temperate clearings. Pair with comfrey for mulch; leave space for autumn digging.
Establishment
Plant crowns after frost into deep fertile soil. Water through summer. Harvest storage roots before hard frost and save crowns separately.
NZ honesty
Honest across much of temperate NZ with enough frost-free days. Early hard frost cuts yield — plant as soon as safe in spring.
Suitable NZ regions
Companion plants
Related guilds
References
- NZ Andean root crop practice — Crown vs storage root distinction matters.