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If you're buying plants now, it’s too early to plant outside
He recommends pinching back annuals and hardening them off to build stronger plants and reduce transplant shock before they go outdoors.
North Dakota State University Extension horticulturist Don Kinzler warns gardeners against early planting, noting that killing frosts are normal in Northern states. Deciding when it is "safe" to plant remains a gamble due to persistent frost risks from Jack Frost.
Temperatures dropping to 32 degrees Fahrenheit can kill most Annual flowers and vegetable Plants. Even Temperatures between 33 and 39 degrees can cause chill injury to tropical Plants, potentially stunting growth.
Move Plants into the garage when night temperatures are forecast to drop below 40 to reduce wilting. When buying Plants early, Readers should use the Hardening process to toughen them against outdoor conditions.
Often termed "pinching back," Removing blossoms from Annual flowers like Petunias and Waves before planting can double stem counts. Removing blossoms allows Plants to direct energy into establishing a solid, well-rooted structure.
Don Kinzler recommends a preferred planting window of May 15 to 25 to avoid late Waves from Jack Frost. While some gardeners begin planting during the Day often associated with Mother, that time carries considerable frost risk.