Each year, wildfires spreading in wildland-urban interfaces (WUI) damage or destroy homes and other important assets, threatening residents and firefighters and sometimes resulting in loss of lives. In most cases, the vegetation located in the area comprised between wildland vegetation and housing is responsible for this fire propagation. This ornamental vegetation can be composed of native or exotic species, but also of landscaping dead fuel materials such as mulches that also sustain fire propagation and present a more heterogeneous structure compared to wildland vegetation. Correctly assessing the flammability of these ornamental species in order to properly choose, locate and maintain them when landscaping is necessary to reduce wildfire risk and prevent fire propagation in WUI. Likewise, an adapted modelling of fire propagation in this type of vegetation is needed.