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All the tutorials that I could find on growing beans have said to find non-irradiated dry beans from a bag:

enter image description here

I even found one article saying that beans can only sprout when they had been dried.

Only dry beans can germinate, so choose from those in the bulk dry bins or those that are bagged.

I'm at a dilemma here because I want to grow Chinese Long Beans, but I can only find them in the fresh state at the supermarket. They only sell common bean varieties in dry bags.

enter image description here

How would I make the beans inside this fresh batch into viable seeds? Or is it not even possible? Some people have said you need to have over-ripened the bean on the stalk and let it dry naturally before plucking them. I wonder if these fresh supermarket ones were picked under-ripe.

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These beans were picked perfectly ripe - for a cook. In the kitchen, “beans” can mean two1 things:

  • A fleshy seedpod, which formed shortly after flowering, but which has not formed a seed yet. Sometimes you can see the future seeds when you look closely.
  • A fully formed seed, which is removed from the seed pod, which by that time is at minimum thinner-walled and tough, or already drying out.

Your beans are in the former stage. The seeds haven’t grown yet, let alone matured. If you want to plant this kind of bean, you need to find seeds (which will look somewhat like the dried beans in your first picture). Finding a seed vendor(no endorsement, just an example) or a gardener willing to share some of their seeds is your only chance.

    You can’t get seeds from this kind of supermarket produce.

When you have planted your beans and you harvest them for the kitchen, you can leave some pods hanging until they are mature, then collect your seeds for the next season. If that’s your plan (as opposed to just planting them for kitchen use), I recommend you make sure that you don’t buy hybrid seeds (“F1” on the pack would be an indication), as their child generation can give weird results.

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1 Just for the sake of completeness: For a gardener, “beans” can also mean:

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This type of bean is also known as asparagus bean and yardlong bean -you should be able to buy seeds ready for planting on line if nowhere else - some here on this site http://www.evergreenseeds.com/asbeanyarbea.html. You can't grow them from these fresh beans now they're cut because the seeds won't ripen.

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  • That's right. Though technically you can grow the unriipe seeds using tissue culture. – Polypipe Wrangler Apr 12 at 21:48

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