Boxwoods Buxus

The Girona and Catalan fire-service gardening guide calls Buxus sempervirens very recommended. Its garden-suitability assessment combines fire evidence with plant structure, care needs and other horticultural considerations. Ohio State's Firewise Landscaping bulletin assigns the same species H for high flammability. These sources disagree about common box itself, beyond any difference between boxwood species.

Ohio also gives hybrid boxwoods a high-flammability rating. A separate 2006 Forest Service and NIST study tested 'Wintergreen', identified as Buxus microphylla variety koreana, and placed it in the moderate-flammability group. That experiment burned whole plants under controlled conditions; it does not establish a result for every littleleaf boxwood cultivar. The researchers cautioned that their moderate group could become highly flammable during drought and should not be planted close to structures.

The word boxwood thus spans a disputed species, a high-rated hybrid group and a specifically tested cultivar. Their source findings remain different even when the shrubs share a familiar garden name.