Frost-covered native plants showing winter resilience

The Overwintering Diary

Understanding the Hibernation phase: How native Finnish plants survive extreme cold and what you can do to support their natural winter adaptations.

Natural Insulation Techniques

Jute Wrapping

Natural jute fabric provides breathable insulation for container-grown plants. Wrap containers loosely, allowing air circulation while protecting root systems from freeze-thaw cycles. This method mimics the natural leaf litter protection found in forest environments.

Snow as Insulator

Snow acts as an excellent natural insulator, protecting plants from extreme temperature fluctuations. When snow accumulates naturally on your balcony, it creates a stable microclimate that prevents root damage. Avoid removing snow unless absolutely necessary for access.

Grouping Containers

Positioning containers together creates shared thermal mass and reduces exposure to harsh winds. This clustering technique helps maintain more stable temperatures and reduces moisture loss through evaporation.

Species-Specific Considerations

Evergreen Species

Evergreen natives like Juniper and Crowberry continue photosynthesis during mild winter days. Ensure they receive adequate moisture before ground freezes, as they lose water through their leaves even in cold conditions.

Deciduous Adaptations

Deciduous species enter complete dormancy, dropping leaves and halting growth. These plants require minimal intervention beyond basic protection from extreme cold. Their natural dormancy mechanisms are highly effective.

Herbaceous Perennials

Many herbaceous natives die back to ground level, storing energy in underground structures. Leave dead foliage in place until spring, as it provides additional insulation and habitat for beneficial insects.

Pre-Winter Preparation

Late Autumn Care

Reduce watering gradually as temperatures drop, allowing plants to harden off naturally. Remove any diseased foliage, but leave healthy material in place. This timing aligns with natural seasonal transitions.

Container Considerations

Ensure containers have adequate drainage to prevent waterlogging during freeze-thaw cycles. Consider elevating containers slightly to improve drainage. Terracotta containers may crack in extreme cold, so monitor them carefully.

Monitoring During Winter

Check plants periodically during mild spells. Evergreen species may need occasional watering if conditions are unusually dry. Avoid disturbing dormant plants unnecessarily, as this can disrupt their natural cycles.