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The characteristic of L.P. gas being heavier than air is correct. This means that when released, propane and butane, the primary components of liquefied petroleum gas, will tend to collect in low-lying areas rather than disperse into the atmosphere. This property has practical implications for safety, as it can increase the risk of accumulation and potential hazards, especially in enclosed or poorly ventilated spaces.

The other options touch on various aspects that are not accurate or relevant to L.P. gas. For instance, L.P. gas does not naturally emit a strong odor. Instead, an odorant such as ethyl mercaptan is added to give it a detectable smell for safety reasons, enabling people to notice leaks. Regarding the state of L.P. gas, it is not a solid at room temperature but rather exists as a gas under normal conditions, though it can be liquefied under pressure. Lastly, L.P. gas is not considered toxic to plants; it primarily poses risks associated with flammability and asphyxiation if inhaled in large quantities.