From the end of March until the second week of May the flowers in the bulb fields bloom. It goes without saying that the exact period depends on the weather. Generally speaking, the best time is the second half of April.
At the end of March the crocus season starts. The daffodils and early and small tulips are next, from the beginning of April. From mid-April the daffodils and the hyacinths bloom. Finally, from mid April until the first week in May the tulips show off their glorious colors.