Arrangements typically last 4-7 days. After a few days, check the water level of the arrangement. If it is low empty water and replace with luke warm, fresh water. To make flowers last longer, recut the stems on a diagonal, cutting about an inch off the bottom.
Keep green plants in medium sunlight, keeping out of direct light. Also keep plants out of extreme heat or cold. Green plants should be kept in temperatures between 65-72 degrees.
Keep floral arrangements away from radiators and windows.