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The bulbs need to be kept at 35 to 45 degrees F. for the entire cooling period of 16 to 18 weeks. If you live where outdoor winter temperatures rarely get below 25 degrees F, just keep the pots of bulbs moist and store them right in the garden beneath a layer of straw.
1 Deadhead tulips after flowering. 2  Allow the foliage to yellow for about 6 weeks after flowering before removing it. 3  The bulbs of Species tulips may be left in the ground for several years; others may be lifted annually, once the leaves have died down, and ripened in a warm, dry place. Plant tulip bulbs in the fall, 6 to 8 weeks before a hard frost is expected and when soils are below 60 degrees F. (See our frost charts.) This timing ranges from early autumn (Zone 4) to late autumn (warmer zones).