Question
Hi Will,

I live in the PacNW (zone 8b). This year for the first time local garden centers are carrying a few tropical plants namely, Crotons and Mandevilla. Bougainvillea grows outdoors here year round but I thought Crotons and Mandevilla were tropical plants exclusively for indoors in colder climates. I would like to plant a few of each for color in my sunny garden if they will withstand the winters in zone 8b. What do you think?

Thanks,
Emily

Answer
Hi Emily,

You have a wonderful growing climate in BC. However, I am afraid you are out of luck as far as Crotons and Mandevilla go. Crotons cannot withstand temps below freezing (Zone 10) and Mandevilla the same except for a few species that tolerate -5 C. (Zone 9). If you get an unusually mild winter, the Mandevilla might make it, but it probably will not. Perhaps global warming will work in your favor!

Please let me know if any of this is unclear or if you have any additional questions.

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Regards,
Will Creed, Interior Landscaper
Horticultural Help, NYC

Visit my website at  www.HorticulturalHelp.com