Quote:
Originally Posted by Sandra75
We just use food coloring to have blue flowers on the next spike?
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It looks as if there is some injection process into the spike itself. I would be surprised if it were any more sophisticated than a blue dye...but the vehicle carrying the dye could be something that facilitates uptake or spreading of the dye etc.
Cut flowers and/or spikes would likely absorb blue dye in water and do the same thing. But if you are leaving the spike on the plant, then you would need a specific means of delivering the dye into the spike. I doubt dye in regular watering would make it through the roots etc.