Watch the watering and fertilizing on that plant. Some soil moisture is good (moist not soggy) and needed but soggy soil is a bad thing that can lead to the plant dying from root rot. Overapplication of fertilizer can burn roots and result in browning of the foliage.
In cooler temps protect from freezing with a cover and if needed on a really cold night by putting a light bulb beneath the cover to provide a little extra warmth.
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