Heave

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1. The partial lifting of a plant out of the soil as a result of alternating freezing and thawing of the soil.

See heaving.

heaved-roots1.jpg

Roots like these, exposed by frost heaving will not survive and will severally weaken a plant.
Source: https://crickethillgarden.wordpress.com/2012/03/13/winter-heaving-of-peony-roots/