When to Plant Asparagus Pea (Winged Bean) in Canberra — Cold / Highland Guide

Two distinct plants are sold under these names in Australia. The true Winged Bean (Psophocarpus tetragonolobus) is a vigorous tropical climber where all parts are edible. The Asparagus Pea (Lotus tetragonolobus) is a small temperate annual with winged pods. This guide covers both, clearly distinguishing them. The Winged Bean is the more useful food crop but is strictly tropical/subtropical.

Current Growing Conditions

Soil temperature: 18.9°C (optimal range: 22–35°C) ✗ Outside optimal range

How to Grow Asparagus Pea (Winged Bean) in Cold / Highland Australia

When to Plant

Too cold for either species. Growing season too short and temperatures too low for reliable production.

Soil
Well-drained, fertile loam enriched with compost. Winged Bean tolerates poor soils due to nitrogen fixation. Asparagus Pea prefers lighter, sandy soils.
pH Range
5.5-7.0
Sunlight
Full sun (minimum 6 hours). Winged Bean requires short days to flower in many varieties.
Spacing
30cm apart, 60cm between rows
Watering
Regular deep watering during flowering and pod development. Winged Bean is moderately drought tolerant once established but produces best with consistent moisture.

Companion plants: Corn, Sweet Potato, Cucumber

Avoid planting near: Onions, Garlic, Other Alliums

Cold / Highland Growing Tips for Asparagus Pea (Winged Bean)

Recommended Varieties

  • Neither species is recommended

Key Challenges

  • Frost
  • Insufficient heat units
  • No viable growing window

Pro Tips

  • Do not attempt. Grow broad beans, peas and regular beans instead
  • If determined to try Asparagus Pea, use a greenhouse or polytunnel

Harvesting Asparagus Pea (Winged Bean)

When ready: Winged Bean: Pods ready when 7-10cm long, still bright green and snap crisply. Wings (flanges) should be flexible, not tough. Asparagus Pea: Harvest at 2-3cm maximum length - larger pods are woody and inedible.

How to harvest: Pick pods individually with a gentle twist or cut with scissors. Harvest every 2-3 days to encourage continued production. For Winged Bean tubers, dig after vine dies back at end of season.

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