What is frost heaving, you ask? Actually it’s not much different than it sounds. Due to wide temperature fluctuations, exposed soil surfaces freeze and thaw repeatedly. This repeated freezing and thawing causes the soil to expand and contract, which can lift up or heave some perennials out of the soil. Heaving may break off some of the plant’s roots. It also exposes the plant’s crown and remaining roots to cold temperatures and drying winds. Freezing and drying injury to a plant’s roots and crown may seriously damage or destroy perennials.