Protection of historical monuments and greening up can coexist! Many houses from earlier style eras are "monument protected" historical sites. Either they always had a green facade or one is produced again later, copied after an old photo or drawing. It can get problematic if a green up should be carried out now for the first time on a historical site ... The three scenarios are examined here.
There are monuments where the facade greening, plants and flowers are also under protection. This is usually the case when the planting was started and already there at the original construction phase. But subsequently attached greenery may be also worthy of protection. Sometimes it's then relevant to ask, who had made the change? Here in the photo, it was the privy of the vineyard house himself, in 1776, who greened and he attached the wooden trellises for roses and vines. Since then, they have been preserved, maintained and renewed ....
It is possible on the basis of old photos that the chances of a green up recovery are good for an old building. Photos may show an earlier planting after it was built.
Here we see at this vestibule of a former noble residence in Weimar / Thuringia, vine-trellises of wood. The trellises were or have been rebuilt, but the planting of the significantly lower maintenance Wild vines were chosen because on the museum's property, little extra income is needed for upkeep. Money is saved.
Sometimes there are reasons to green up old houses and buildings that have never ever had green walls, if only to change the "cold beauty" many perfectly newly restored monument facades have. A return back to a warm green life may be called for. In such cases, the authority over the building may throw a spanner (monkey wrench) into the works because:
-If it is a monument, the restored look may not be changed or greened-up by law. -It's better to be safe and to seek dialogue with the authority before greening up because in the worst case scenario, the vegetation cover must be removed or there could be subsidies to repay. However, there indeed may naturally be a delicate bit of greening, with Clematis or annuals occuring. And if a tender green plant quietly creeps up on a protected building and then her tendrils beg for a mostly invisable thin climbing wire, who would deny her this chance? Even the most hardened preservationists wouldn't ..