Tulips can sometimes be a bit disappointing when they fail to reappear the following year.
Sometimes its squirrels, which love the bulbs, and you need to put a physical barrier in place such as chicken wire to stop them digging up the bulbs.
Other times it's the variety of Tulip- the image left is from Thompson and Morgan, Tulip " Everlasting mixed" which is billed as perennial. Lovely strong colours for a bright spring display. click here for details