Last edited on October 17, 2019. View history
Purple Yard Long Bean
A variety of yardlong bean
How to sow purple yard long bean: Direct seed outdoors, 8cm apart. Thin seedlings to 30cm.
Sun requirement for purple yard long bean: Plant in Full Sun
The Yardlong, or Asparagus, Bean is a pole bean that produces slender, 45cm long bean pods. Beans have a nutty flavor and can be steamed, sautéed, or stir-fried. The pods can also be left on the plant to mature and then shelled and used as dried beans. Plants need to be trellised and inoculation before planting may increase yields.
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Purple yard long bean facts
Lifespan
Crop cycle
Max altitude
Optimal light
What are growing degree days?
A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.
Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.
For purple yard long bean, the FAO EcoCrop database gives a lowest growing temperature of 15°C and a shortest growing cycle of 30 days at its best temperature, about 450 growing degree days to a first harvest.
Where you've told us where your garden is, we use this and the weather there to predict when your purple yard long bean will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.
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Time to harvest
If sown now, expect a first harvest in about 30 to 240 days.
From the growing cycle in the FAO EcoCrop database, which is the same wherever it is grown.
Ecological requirements
Data from the FAO EcoCrop database for Vigna unguiculata (L.) Walp.
| Family / Taxonomy | Magnoliopsida Rosidae Fabales Leguminosae |
|---|---|
| Killing temperature | growth: -1 °C, rest: -1 °C |
| Life form | herb |
| Life span | annual |
| Habit | prostrate/procumbent/semi-erect |
| Optimal soil depth | medium (50-150 cm) |
| Optimal soil texture | medium, light |
| Optimal soil fertility | moderate |
| Optimal soil drainage | well (dry spells) |
| Optimal soil salinity | low (<4 dS/m) |
| Photoperiod | short day (<12 hours), neutral day (12-14 hours) |
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