There are a host of cold hardy Flower Bulbs as many of them are indigenous to Europe or Central Asia which have very cold climates. Many spring blooming varieties actually require a chilling period to break the dormancy of the embryonic plant inside the bulb.
Cold Hardy Bulbs:
- Allium
- Tulips
- Crocus
- Glory of the snow
- Daffodils
- Daylilies
- Fritillaria
- Hyacinth
- Siberian Iris
- Snowdrops
Any of these flowering plants should withstand zone 4 winters with a little care. In areas of the country where the average temperature regularly drops below zero we recommend adding a foot of mulch as protection which can be removed in the spring time when the danger of severe freezing temperatures has passed. Otherwise, rest assured, occasional cold temperatures are good for bulbs.
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