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Dr. Leonard Perry, Horticulture ProfessorUniversity of VermontOf all the culture given to houseplants, watering is probably the one cultural practice that causes the most problems—more often overwatering— and where inexperienced gardeners can go wrong.  It really isn’t that difficult or rocket science once you consider environmental factors, and the individual plant needs.    The type of soil used as a potting medium affects watering, as does light exposure, temperature, and humidity.  Just as many environmental factors change with the seasons, so do the water needs of plants.  Plants in a warm room, particularly near a wood stove or with forced-air heat, will dry out sooner than those without these conditions.  Hanging plants often dry out more quickly than those in pots on...