How should shrubs and trees be arranged to reduce ignition risk near a home?

• A. Create horizontal and vertical separation, avoid continuous fuels around the structure, and place lower shrubs away from the building
• B. Plant dense continuous fuels around building
• C. Remove all vegetation from property
• D. Only plant tall trees near the building

Answer: (A)

Managing vegetation around a home to reduce ignition risk means creating defensible space by interrupting flame paths and limiting heat reaching the structure. The best arrangement keeps fuels horizontally and vertically separated and avoids a continuous band of vegetation around the home. Lower shrubs should be kept away from the building so flames or radiant heat can’t easily reach siding, windows, or vents, and to prevent ladder fuels from connecting ground fuels to tree canopies. By spacing plants and keeping vegetation non-continuous around the house, you slow fire spread and reduce ember ignition potential. In practice, you would place low, nonflammable ground cover closest to the home, create gaps between plantings, and maintain distances to larger trees, pruning lower limbs to reduce vertical fuel connections. Dense continuous fuels around the building, removing all vegetation, or only planting tall trees near the building would increase ignition risk by forming continuous fuel paths or ladders for flames and embers.