Quick Answer
Landscaping can indeed enhance passive solar heating efficiency by strategically utilizing plants, trees, and groundcovers to absorb, store, and release heat, as well as to block cold winds and winter sun, but not summer sun.
Enhancing Winter Sun with Evergreens
Evergreen trees and shrubs can help absorb and store cold winter air, then release it during warmer winter days, creating a microclimate that retains heat. Planting them strategically around the building can create a thermal mass effect, reducing heat loss during cold snaps. For example, a row of tall evergreens (like arborvitae or spruce) planted 10-15 feet from the building’s south side can block harsh winter winds and create a warmer microclimate.
Strategic Groundcover Selection
Some groundcovers, like thyme or creeping juniper, can be used to cover large areas of ground, reducing heat loss through radiation. These plants have low thermal mass and can be as close as 6-8 inches to a building’s foundation without causing any damage. Selecting the right groundcovers can make a significant difference in maintaining a warm and cozy indoor temperature during cold winter months.
Creating a Winter-Solar Garden
Creating a winter-solar garden involves planting a mix of trees and shrubs that can provide shelter from harsh winter winds, while also allowing winter sun to penetrate through the foliage. This can be achieved by planting deciduous trees like oak or maple on the north and west sides of a building, which will block cold winds but allow winter sun to enter during the day. By carefully selecting the right plants and arranging them strategically, you can create a winter-solar garden that enhances passive solar heating efficiency and reduces heating bills.
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