Fall planted bulbs such as tulips, hyacinths, daffodils need cold temperatures in order to produce a flower bud in Spring. If you are located in hardiness zone 8 or above chilling these bulbs prior to planting will help increase the chance of blooms on your tulips in Spring. Tulip World provides the service of chilling our regular inventory of bulbs for 10-12 weeks in fall for you at our warehouse, we will then ship the bulbs to you once they have received the 10-12 week pre-chilling treatment.