When spring bulb flowering has come to an end, it is best to leave the bulbs alone and expose the foliage to the sun. This will help the bulbs rejuvenate for the following year. Having said that, however, you should prune (deadhead) fading blooms so the plant’s energy isn’t wasted on producing seed, but rather on nurturing the bulb. There is no need to dig bulbs out once the flower production is over. In Canada, for example, bulbs will last two to three years, though they can last up to fifteen years if the soil was enriched with bone meal, peat moss and manure at time of planting.