Just happen to have a little experience with those.
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I call them asparagus beans and same as Chinese beans, long beans etc. They have a taste that is sweet and mild that some say resembles asparagus.
1) Are they worth it?
Yes, they are a very nice change from green beans. Here they seem to stand up to our heat and humidity better than regular green beans. Very productive. Low maintenance. They prefer warm not cool temps.
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2) Taste?
As mentioned earlier a bit like asparagus. Very mild when you pick them at less than three feet.
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3) other uses...they make an incredible stir stick for such as bloody Mary drinks. Really good!!
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They are really more like a cow pea than a bean and have great soil building properties. I think you will enjoy them.