Fall-planted flower bulbs such as tulips, daffodils, hyacinth, or crocus are wonderful additions to the landscape, but if you live in warmer winter climates (as in USDA zones 8 and above), these bulbs will need to be pre-chilled or vernalized before planting to successfully bloom. If you are in zones 4-7, your bulbs will receive enough natural chilling over the winter to bloom successfully and will only need to be dug up and divided every 3-4 years. Read the full article here.