Bulbs have a tendency to grow in adverse conditions; either rapidly in the spring or in extremely hot, dry climates. Bulbs are invaluable in bringing color to your garden and they are easy to combine with other plants. If you plan ahead you can have bulbs flower year-round.
Make sure to not plant bulbs where you accidentally may dig them up during the summer. They easily become neutralized with the right conditions, and will spread automatically over the years. When grown in lawn, don't cut the grass until the leaves have died back, or the bulbs will not build enough food reserves in order to flower the following year.