Posted: 04/05/2013 at 19:49
They're too shallow, then. The bulb needs twice its own height of soil above it. So, if your bulb is about 7cm tall, it needs 14cm of soil above it - about 15cm is usually the maximum needed. This is especially important if you have dry, sandy soil, which you probably do.
Once the bulbs have finished flowering, dig them up and plant them deeper, then feed and water them as usual.
Hopefully, you'll get more flowers next year.