There are a few precautions you can take to ensure that you're providing your lavender with the dry conditions that it loves. Planting in a raised bed with good drainage can help, as can planting it alongside a walkway, driveway, or other structure that retains heat and can contribute to drier conditions. If you use drip irrigation, place the emitter a few inches away from the plant, so that it's not right above the root ball.