The Orchid Doctor Articles under the Heading Water, Cold

Water, Cold Comments
WATER, COLD: Chills the Plants Tap-water in winter can be warmed with a kettle-full of hot water used to warm the water in a watering can. OR69-50 0
WATER, COLD: Splashing on Phalaenopsis Leaves Cold water causes leaf (mesophyll) collapse on the upper surface; a slightly sunken, light green pitting which is reproduced on the under surface, leading to the yellowing of the leaf. A75-498 0
WATER, COLD: Watering Damage to Orchids There is no damage done using cold water to water plants; commercial growers no longer "temper" the water even when it is as low as 39 deg.F. A71-1021 0

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