While planting, I dug out a lot of bricks and stones that I am assuming were left behind during the building of the house. I planted marigolds next to my tulips, watered them, then by the end of that week, I noticed that my tulips were slowly diminishing.O also noticed that weeds were beginning to grow in with them. What can I do to kill the weeds without killing my flowers? The bulbs are all gone, but them stems are still green, but starting to yellow. Should I cut off the tops of the stems to preserve them or are they as good as dead? Is there any hope that they will grow back?