Heavy particle transport in a trellised agricultural canopy during non-row-aligned winds

•Particle dispersion near the source in a trellised agricultural canopy is studied.•Concentration data was obtained during field experiments using a 3D sampling array.•Plume behavior was investigated using a novel Gaussian-based interpolant.•The canopy architecture had a significant impact on plume shape.•Shape parameters varied with mean wind direction relative to the canopy.