Catmint (Nepeta) is a hardy perennial, blooming from late spring into fall. Though resilient, specific winter care enhances its longevity and ensures a vigorous return with abundant spring flowers. This preparation helps the plant withstand cold and emerge healthier, even in milder climates where it may remain semi-evergreen.
Preparing Your Catmint for Winter
Preparing catmint for winter involves steps to ready the plant for dormancy. Pruning can be done in late fall, cutting the plant to 2 to 4 inches above ground. This makes spring cleanup easier, though leaving some foliage protects the crown and shelters overwintering insects. Some suggest waiting until spring to avoid winter damage to new growth.
A final, deep watering before the ground freezes ensures the root ball does not dry out during dormancy. Then, apply a 2 to 3-inch layer of organic mulch, like leaves or shredded bark, around the plant’s base. This insulates the roots and crown from harsh winter conditions.
Ongoing Winter Care
During winter, catmint in the ground requires minimal attention as it enters dormancy. Container-grown catmint needs more care due to reduced root insulation. Move potted plants to a sheltered location, like against a building or in an unheated shed or garage, for protection from extreme cold. Raising pots on bricks or “pot feet” aids drainage, preventing roots from sitting in waterlogged soil.
Dormant catmint does not require much winter watering, as excess moisture can lead to root damage. However, during extended dry periods or brief thaws, a light watering can prevent the root ball from drying out. Avoid overwatering and ensure proper drainage, especially for container plants. Check plants periodically for rodent damage or excessive snow accumulation that could harm branches.
Spring Transition
As winter recedes and spring approaches, actions help catmint transition to active growth. If mulch was applied, remove or thin it out in early spring before new growth emerges. This prevents smothering new shoots and allows the soil to warm. Once tiny green shoots are visible, it is a good time for spring pruning.
Pruning in early spring involves cutting old, dead stems to 1 to 2 inches from the base. This encourages vigorous new growth and maintains the plant’s shape. Though catmint has low nutrient requirements, a light compost application in early spring provides a gentle boost as the plant awakens. Monitor for new growth and ensure adequate moisture as temperatures rise to support a healthy start.