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Depends on where the plants are coming from, and weather all in between. Good news is plants can take cold temperatures (as long as they don't freeze) much better than hot. For me here in FL, it's often safer to order plants in the winter than in the summer. (Again, depending on their point of origin.)
If plants are going to be in the mail 24 hours, heat packs can usually ensure safety. Over 24 hours and it becomes more risky, depending again on the ambient temps.
If plants are going to be in the mail 24 hours, heat packs can usually ensure safety. Over 24 hours and it becomes more risky, depending again on the ambient temps.