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The impact of plants growing on buildings remains controversial, especially for vulnerable historic walls and ruins requiring on-going conservation. English ivy ( Hedera helix L.) can cause considerable damage where it is able to grow into deteriorating masonry, yet in some circumstances it may be protective. Here we focus on the potential of ivy to buffer damaging thermal cycles and frost events that can contribute to the deterioration of masonry materials. On limestone masonry test walls in central Southern England (Wytham near Oxford, UK), ivy foliage had a significant influence on stone-surface freezing regimes.

Over two successive winters (2012/13 and 2013/14) the frequency of freezing events under ivy was reduced on average by 26%, their duration by 34% and their severity by 32%. A subsequent laboratory simulation showed that stone mass loss, surface softening, and textural development were all significantly reduced under an ‘ivy covered’ thermal regime. Cautious extrapolation indicates that ivy can reduce frost-driven granular-scale decay of limestone by the order of 30 g m −2 yr −1, depending on the local freezing regime. Whilst the capacity of ivy to cause damage should not be underplayed, vertical greenery can aid heritage conservation efforts by mitigating specific environmental threats. Introduction The potential for ivy and other higher plants growing on masonry structures to cause damage in some circumstances is unquestionable –. For historic structures, greatest damage is associated with stems growing into existing defects (i.e., holes, cracks, deteriorating mortar etc.), where very thick (older) stems grow under wall foundations, and where the plant produces ‘true’ roots within the fabric of walls,.

Whilst these damaging effects do not always occur, ivy has gained widespread reputation as a considerable nuisance for historic buildings and for those tasked with their management and conservation. Very often active measures are taken to stop ivy from growing, and where it has become established, the decision is often made to remove it entirely. Removal is, however, often difficult, time consuming and expensive, and in some cases attempts to remove well-established growth will have disastrous consequences for the underlying structure. There are also strong arguments against removal given its considerable contribution to biodiversity – and – some would argue – aesthetic appeal –. This is especially true in the case of ruined sites and at a time when ‘greening’ of the built environment to maximise ecological and social value is high on the policy agenda –.

Accepting its potential to cause damage, there is evidence to suggest that in some cases a cover of ivy can be beneficial for historic walls, and that costly removal is unnecessary or entirely inappropriate. For example, where underlying masonry is in a good state of repair and appropriate efforts are made to trim or restrict growth away from gutters and roofs, the risk of ivy stems penetrating into a structure is negligible; ivy attaches by means of surficial aerial rootlets and stems have no capacity to ‘bore’ into construction materials unless defects already exist, –. Where masonry is sound, any perceived risk of structural damage could be outweighed by other beneficial effects.