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Environmental Problems

Q.SPRAYING OYSTERSHELL WHEN TEMPERATURES GO BELOW FREEZING AT NIGHT

Zone Calgary | Anonymous added on April 8, 2022 | Answered

Our cotoneasters look as if they could burst into leaf very soon. However, at night the temperature is falling 3 or 4 degrees below freezing. Should I treat against oystershell now? Or would it be advisable to wait until there is no risk of frost at night? I look forward to hearing from you. Thank you very much.