Oh no! That’s such a shame. It’s worked for us everytime, so not sure why! Maybe there wasn’t enough colour in the water? Or maybe the ends of the stems were dried up, and so not absorbing any of the water? It works with all sorts of vegies too (like celery stalks), so maybe next time you could try a few different flowers and vegies, so if one doesn’t work the whole experiment isn’t lost?
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