The fruit, when dry, usually splits open forcefully, effectively scattering the seeds. I have heard stories of walking along the trails on Montara Mountain while the Lupine are popping, but have yet to experience this. On Montara Mountain, particularly bothersome invasives include Bird's Foot Lotus and the infamous French Broom , species that are so aggressive they inhibit any native vegetation from re-establishing in disturbed areas.
Elimination is advised.
Fabaceae is well represented on Montara Mountain. Yellow turning to Orange, pea-like in clusters at top of stems. Nearly all trails - disturbed areas. As an invasive alien species, Bird's Foot Lotus seems to taking over many of the niches normally occupied by the natives Varicolored Lupine and Deerweed . We've tracked it's spreading up about a mile of San Pedro Road in McNee Ranch State Park in the last 3 years.