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How cool is the tropical blue butterfly pea.

 
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I'll do some research as an example of due diligence before I rush out and try the tea as it's used in herbal medicine.   But this tropical vine grows a beautiful blue flower that makes a natural color changing food dye.  They use it hot and cold in teas.  E
It's naturally blue but mix in a acid like lemon or tonic water and you can watch as it changes color.  

The plant itself is a nitrogen fixing vine that is commonly used to help restore soils.  Between that and how marketable the dried flowers are I wonder if any of our tropical permaculurists are growing this.
 
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I had to look that one up Casie; it sure is beautiful!


source

A temperature preference of 78-100oF and no frost tolerance means it would be a conservatory plant here, although apparently it can also be grown as an annual.


(edited to add better picture)
 
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I agree that they are beautiful and I really want to grow some to play with as a tea and natural food dye. I haven't had any success so far. 😢 I bought seeds from Baker's Creek last year and I scarified then and soaked them and they never germinated. I always save a few seeds just in case, so I have three seeds left to try again. I'm trying to find better info about how to geminate them. Those seeds were expensive!
 
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