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why do poinsettia leaves turn black on edges

Improper watering causes plants leaves to turn black and drop prematurely. While overwatering causes margins or tips of leaves to turn black and roots to rot, underwatering causes them to dry up and appear scorched, especially if exposed to direct sunlight. While different plants have different irrigation requirements, ensure the soil around the plant remains evenly moist at all times or water when the top 1 to 1 1/2 inches of the soil feels dry. If container growing plants, use pots with adequate drainage holes at the bottom.

Avoid causing puddles or pools of water at the base of the plants. If possible, use a drip irrigation system or soaker hose that provides a controlled amount of water at soil level instead of a garden hose.
Follow the correct reflowering procedures. The poinsettia is a photoperiod plants, which means that its budding and flowering schedule is determined by the amount of daylight it receives.

So in order to have the plant blooming at Christmas time, you will need to limit its exposure to light in the months running up to the holidays. From the 1st of October onwards, keep the poinsettia in complete, uninterrupted darkness for 14 hours a night, from 6 p. m. to 8 a. m. Move the plant to a dark room or cover the plant with a box. Be aware that even exposing the plant to artificial lighting can halt or delay the reflowering process.

Remove the plant from the darkness during the day, as it will still need about 6 to 8 hours of daylight. Try to maintain the temperature between 60 and 70 degrees F and continue to water and fertilize the plant as normal. Follow these procedures for approximately ten weeks until the poinsettia reflowers and the bright red color begins to show on the bracts. Move the poinsettia back to a sunlit area and follow the care procedures described in the previous section!

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