hi minnycourt

about the trays of water. the point about the tray of water with pebbles or rocks is this:
a tray of water under the
plant provides humidity by having the water evaporate around the
plant, thereby increasing the humidity in the immediate vicinity of the
plant. trays under
plants should have pebbles or rocks in them only to provide support for the
plant so that it isn't sitting directly in the water which can cause root root.
about the
plants you bought. i have a peace
lily, 2 scheffleras, and 2 "sticks" of lucky bamboo. the peace
lily is the easiest to know when to water because as soon as the soil gets too dry, the leaves will droop. i say the
plant is pouting
the schefflera will tolerate dryness better than the peace
lily, although, once you get to know your
plants, you will see that the schefflera will pout also.
as far as the lucky bamboo is concerned, i potted mine up into potting soil and water it when i water the schefflera. (they are the same room) it will pout also, but it is tempermental with me, so i don't really let it get to me.
good luck!