Browning leaves are most likely the result of a watering issue. Your plant may not be receiving enough water, or a gap in the soil is barring the water from reaching your plant’s roots. Make sure the soil is filled in, and heavily water your soil every session.
For some reason, our lantana plants look lifeless this year. What do we do?
This condition is most likely the same watering issue as above. Lantanas love their water as much as their sunlight, especially when young. Make sure that your plants are getting ample water and sunlight. Ensure your soil is consistently moist between waterings.
You can also check for pests, especially if the leaves are lifeless (drooping and poor coloration).