Growing etrogs is a difficult business. Too much sun and the yellow skin of the citrus fruit will burn; too little sun and the flowers won’t blossom. There’s infestation to worry about—red citrus mites are particularly fond of them. And then there are the religious prohibitions; blemishes render the fruit, a citron in English, useless for Sukkot, so if a branch or leaf pierces the skin of the etrog, you’re in trouble.
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