I have a problem with my columbine, there seems to be a small green worm that eats all the leaves of the bottom of the plant then heads up to the flower. It is not just one worm, there are hundreds on this one plant, but they don't seem to bother anything else. I've tried straws, and wire around the top, but it still seems to be chancy as to whether or not they will last as long as cuts in a vase. Dear Jeannie, Your question does not have a simple answer.
Some professional florists have a similar problem.
The problem of Gerberas wilting in oasis is usually caused by bits of the oasis breaking loose as the stem is inserted and blocking the stem. Gerberas are more susceptible because the internal composition of the stem is less dense than many flowers so it is easier for bits of debris to get in there. Anna Trilliums require acid soil and prefer a moist, shady environment. The growth from bulb is slow, planting into a well prepared peat bed is better than regular repotting over several years as well, which repeatedly disturbs the roots. Trillium bulbs are best stored in a slightly moist environment.