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Old 09-15-2023, 10:51 PM   #3 (permalink)
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Location: Central Vancouver Island, BC Canada
Zone: AgCan 7b, USDA 6b
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Default Re: Sunburn On Newly Acquired Truly Tiny Cavendish

Hard for me to tell from the pics, but plants sold as truly tiny often have dark wine staining on the leaves. However, if you are seeing new dark spots on mature leaves, that sounds like a different animal.

Make sure you are protecting your black plastic pots from direct sun exposure for too long. Even a few minutes can cause the inside of the pot and adjacent soil to get very hot. Too long and that heat will radiate deep into the potting mix. Wrap it with something white or light colored or put it inside another pot with some insulation, i.e. ceramic, wood, or a bigger plastic pot with air space between the inner and outer pots
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