| Word | Description |
| Larval | The immature stage of an insect in the newly hatched, wormlike feeding stage |
| LCLM | Limited commercial landscape maintenance |
| LDL cholesterol | “Low-density lipoprotein” is the major cholesterol carrier in the blood. If too much LDL cholesterol circulates in the blood, it can slowly build up on the walls of the arteries that feed the heart and brain. Also referred to as "bad" cholesterol. |
| LED | Light Emitting Diode |
| Lesions | Spots on the leaf surface. |
| Lichens | Lichens are flaky moss-like organisms that grow on the bark and branches of our landscape trees or shrubs. They do not attack and kill. |
| LLO | Limited Lawn and Ornamental |
