Are there any restrictions on using polyethylene flower boxes in heritage sites?

Using polyethylene flower boxes in heritage sites often comes with specific restrictions to preserve the historical and cultural integrity of these locations. Heritage sites are typically governed by strict conservation guidelines that regulate any modifications, including landscaping elements like flower boxes. Authorities may require materials that blend with the site's aesthetic or avoid synthetic options like polyethylene. Always consult local heritage conservation boards before installing such features to ensure compliance. Proper planning helps maintain the site's authenticity while enhancing its visual appeal.