White cardboard soil sunblock. Good or bad?

Paradox

Imperial Masterpiece
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Pretty sure Mike is joking.
Putting them in a refrigerator isn't a solution
 
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This got me thinking...cheese cloth could probably be left on full-time. If it rots away, just throw some more on. Partial blockage, like shade cloth, and would allow water and air to pass freely. I might try that on my japanese larch this summer!
 
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