Verena, I certainly thought your question a good question and not trivial at all. You will find so much help and information on this site and you won't learn if you don't ask the questions. We all learn from others questions and we all have different circumstances as Jane pointed out so the answers are always enlightening. I am so thankful for all of the people on this site who so readily take the time to share their knowledge. Carolyn Craft Los Gatos, CA where the weather is still so nice and so many flowers are still in bloom or already in bloom early.