It's very disappointing, after all the hard work in the autumn of planting bulbs, only to find they do not flower the next year. The best time to resolve the problem is in the spring when the bulbs should be flowering and are in leaf. The most common reason for a bulb not flowering is that it has been planted too shallow. Whilst the plant is in leaf, but not flower, is the best time to dig up the bulb and re plant to a greater depth. There can be different reasons for different types of bulbs and here are some tips to make sure the spring bulbs flower next year.