When to Plant Asparagus Pea (Winged Bean) in Sydney — Warm Temperate 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: 19.3°C (optimal range: 22–35°C) ✗ Outside optimal range

How to Grow Asparagus Pea (Winged Bean) in Warm Temperate Australia

When to Plant

Asparagus Pea: Sow October-December after last frost. Harvest in 8-11 weeks. Winged Bean: Do not attempt - insufficient heat and day-length.

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

Warm Temperate Growing Tips for Asparagus Pea (Winged Bean)

Recommended Varieties

  • Asparagus Pea (Lotus tetragonolobus) only - Winged Bean will not succeed

Key Challenges

  • Season too short and cool for Winged Bean
  • Asparagus Pea has very small yields

Pro Tips

  • Asparagus Pea is a novelty crop here - low yielding but interesting
  • Harvest pods at 2-3cm maximum or they become woody and inedible
  • Grow as a ground cover between other crops

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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