Edit: Resolved: Solution: 1. In VFX Graph 12.x, this bug no longer exists. 2. In VFX Graph 10.5.1, use this workaround: Set the lifetime of the particle in the strip to anything to make the particle strip quad honor the alive == false condition, and then disable Age Particles in the Update Particle Strip's inspector to make the particle in the strip immortal until the user-defined condition is met. --- Original post: --- I set alive = false on an otherwise immortal particle strip but the quad remains (magenta below): The blue square is a particle head, which spawns the particle strip over time. Here is the graph: The particle quad (blue) honors the alive == false condition and disappears. The particle strip quad (magenta) does not honor the alive == false condition and does not disappear. The docs say that killing immortal particles should be possible: Does anyone know how to kill particle strip quads in this case?