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Collectoritis Patient
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It will grow emersed, but my experience with Crypts has always been that they actually grow faster when submersed. Have you tried root feeding with something like Flourish tabs or DIY Osmocote tabs?

Are you adding CO2 at all? That's another big way to boost growth.

It likely will not work well just sitting outside in Canadian weather. Cryptocorynes need a tremendous amount of humidity to grow emergent.
 
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