Plants particularly susceptible to harm caused by low temperatures include aglaonemas, dieffenbachias and fittonias. Symptoms such as brown spots on leaves and leaf edges can be seen on chilled African violets, philodendrons, syngoniums and sansevierias. The last two winters have been especially tough ones for houseplants. Many plants were injured even though they sat next to double-paned glass. To a plant, a cold windowpane can seem like a huge chunk of ice.
Any cold window creates, in effect, a draft.
Air cooled by the window becomes heavy and settles, passing by your plants as it goes. Drawing the drapes between glass and plants is one remedy. Other Tip Burners Plant shine compounds may enhance foliar appearance a great deal. But too much shine can reduce a leaf's ability to photosynthesize and may injure its growth. The injury starts, of course, at the leaf tips.