Tips for Success in Growing Zones 8-11
Most spring-blooming bulbs, including tulips, daffodils and crocus, come from climates with cold winters. So if you live where winters are mild and frosts are rare (zones 8-11), you will need to "pre-chill" these bulbs so they bloom properly. Instructions are below.
Bulbs that are native to warmer climates do not require a chilling period. These include Dutch iris, Anemone DeCaen, Anemone St. Brigid, Freesia, Ranunculus and Scilla peruviana. Where these bulbs are winter hardy (zone 8-10) they can simply be planted in fall for spring flowers.