Name: Kathy Arkansas (Zone 8b) "Pets should not be a whim"
Our winters here in the deep south aren't as cold as the ones you northerners have, & I've never had a mandevilla.....but I think if you aren't bringing them indoors for the winter, maybe wrap bubble wrap around the pots (no plastic should touch the actual any part of the plant). I've done something similar with pots I couldn't bring indoors or small trees or shrubs bought months before winter but too small for me to feel comfortable leaving them unprotected. I surrounded the ones planted in the ground with fencing held up & away from the tree/shrub. Then I dumped pine straw & leaves all around to insulate.
Some ideas:
"Don't breed or buy while animals in shelters die."
"A righteous man cares for the needs of his animal..." Proverbs 12:10
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