Spring Flowering Bulbs (hardy bulbs) such as Snowdrops, Crocus, Daffodils, Tulips, and Hyacinths need a cold period during the winter to jump start
their growth cycle so that they will flower in the spring. They can be planted until the first frost. In general, Spring Flowering bulbs will grow best in climate
zones 4-8. Spring Flowering bulbs normally start
blooming in February with Snowdrops and end in June with the Alliums.