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I had the same problem with a large planter of John Gray ,have lost all but two bulbs,and have put it down to the long spell of extreme cold,also lost 3 yes 3 Camellias as well also in large planters,these were sheltered to some extent by the garage wall,only consolation if you can call it that is that we had another that survived
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We lost two Camellias, also in pots. I did read somewhere that it was a fungal problem which was very prolific this winter/early spring that was the problem and really affected Camellia plants grown in pots.