Netherland Bulb Company

Spring planting bulbs are bulbs that should be planted in the spring and bloom in the summer. The number of spring bulbs is quite extensive, but the most popular varieties include gladiolus, begonias, dahlias, lilies, freesia, anemone, tigridia, acidanthera, montbretia, sparaxis, iris, brodea, liatris, and callas. 

In general, look for firm and healthy bulbs. Bulbs that are mushy usually have not been kept in a cool dry place and will rot and therefore not flower.  When buying tubers, look for tubers with 3 to 5 eyes and initial root formation.

Spring planted/summer flowering bulbs and tubers can be planted in the spring when you are certain the ground will no longer freeze in your area.

The rule of thumb is to plant the bulb or tuber about 5 inches deep. Exceptions include dahlias and begonias which should be planted just beneath the surface.

For smaller varieties, 4 inches is a good interval, 5 inches apart for gladiolus and 10 inches for begonias. Lilies should be about 12 inches apart and dahlias as much as 16 inches apart. For uninterrupted color, they can be planted even closer together.

Once your bulbs have finished blooming, they can often be used again the following year. With the exception of lilies, the bulbs have to be taken out of the ground if it freezes in your area during the winter. If it does freeze in your area, let the leaves die down naturally, then dig up the bulbs and store in a cool dry place and replant the following spring.

Please refer to Helpful Links for the Gardener. This page has a number of links to reputable bulb organizations as well as US universities with extensive agricultural programs.