How does snow cover affect where tundra plants can grow?

Snow cover is a critical factor in determining the distribution and growth patterns of tundra vegetation. Its influence is primarily exerted through protection, moisture regulation, and the timing of the growing season.12

• Winter Protection: Most tundra plants require snow cover to shield them from the extreme cold and drying conditions of winter. In areas where snow is blown away by strong winds, plants lack this insulation and may struggle to survive.1
• Growing Season Timing: The depth and duration of snow cover dictate when plant growth begins. Areas cleared of snow early in the season are the first to initiate growth in the summer. Conversely, areas with deep snowbanks that are slow to melt support only those species adapted to a shorter, snow-free growing season.1
• Moisture Availability: Winter snow accumulation serves as a primary source of moisture for summer plant growth. Windy, exposed areas with little snow cover often experience summer drought, which limits plant development. In contrast, snow-bed communities benefit from the meltwater, ensuring they remain well-watered throughout the summer.1

Consequently, vegetation distribution is highly localized, reflecting these variations in microclimates, soil moisture, and snow depth.2