* Tradition and Aesthetics: Ivy-covered buildings became associated with old, prestigious institutions, creating a visual shorthand for tradition, history, and academic excellence. This aesthetic became a self-perpetuating cycle: older buildings got ivy, and newer buildings at institutions aiming for a similar image might be intentionally planted with it. It evokes a sense of permanence and scholarly pursuit.
* Early Landscaping Practices: In the past, ivy was a readily available, relatively low-maintenance groundcover. It was often planted to simply cover walls and improve the appearance of otherwise plain buildings.
* Insulation (a debated benefit): Some argue ivy provides insulation, reducing heating and cooling costs. However, this benefit is often minimal and may be outweighed by the damage ivy can cause to the building's structure. The insulating effect is largely dependent on factors like the thickness of the ivy, climate, and building material.
* Erosion Control (on older buildings): On older structures with brick or stone walls, ivy might help stabilize the mortar, reducing erosion, although this is again often outweighed by the negative consequences.
Why ivy is often *removed* now:
Despite its historical appeal, ivy is increasingly being removed from buildings for several reasons:
* Structural Damage: Ivy's roots can penetrate mortar, brick, and even stone, causing significant damage over time. This damage can lead to costly repairs and even compromise the structural integrity of the building.
* Moisture Retention: Ivy can retain moisture against building walls, promoting the growth of mold and mildew and leading to water damage.
* Maintenance: While ivy might seem low-maintenance, removing it can be a significant undertaking, requiring specialized equipment and potentially causing damage during removal.
* Increased awareness of the damage: The ecological and structural downsides of ivy are better understood now than in the past.
In summary, ivy's presence on college buildings is largely a legacy of historical aesthetics and landscaping practices, although its continued presence is increasingly being questioned and countered due to the significant structural damage it can cause.