Care for an ailing mandevilla plant

I bought 3 mandevilla plants this spring from Lowes and one of them seems to be dying. I planted them along a fence so they get plenty of sun every day, at least 6 hours. I have fertilized and mulched them and water about 2 times a week. The other two plants are doing fine. This plant gets about an hour more shade in the afternoon than the two healthy plants, but still gets a full 6 hours.
Help, please!
Don

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1 Comment To "Care for an ailing mandevilla plant"

#1 Comment By Downtoearthdigs On 07/22/2018 @ 9:56 am

If these are new plantings, make sure you are adequately watering. Depending on temperatures and soil, twice a week may not be enough.
Daily water for the first 2 weeks is generally required.

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