No, some gases readily form vapor clouds that are a mixture of air and flammable gas. The mixture is often the right ratio for fast burning if the cloud finds an ignition source. The cloud can float over a plant and will create a huge pressure wave on ignition. The pressure wave will crush everything underneath.
>he cloud can float over a plant and will create a huge pressure wave on ignition
Got it. Kind of like how a MOAB unleashes its fuel/air and then touches it off.