Hi Olivia, The curling of the leaves is no good, it is a sign of stress, Maybe it’s too wet at this time of the year? I wouldn’t fertilise until you see sign of some new growth maybe in about 2-3 weeks if the mandarin is in a garden use Organic liquid fertilisers and the Kolush Mulch around the plant. If the plant is in a pot use Novatec fertiliser.
Thanks the Palmers Team
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