No Flowers On Lantana Plants: Reasons Why A LantanaWon'tBloom.No flowers on lantana have a number of causes, but by far the most common cause is planting them in the wrong spot. If your lantanawon'tbloom, take a look at these reasons why a lantana does not flower. Purple LantanaWon'tBloom. Gail Murphy asksMy purple lantana doesn't bloom but it is growing well, why? Answer. Is the lantana is planted in the right location, full-sun and well-drained soil? Over watering and over fertilization can cause lantana not to bloom. You don’t give much info to work with, but based on what you told me, It doesn’t particularly like rich soil nor excess watering. It also takes a couple or 3 years to get enough growth behind it to do a lot of blooming. And it may not bloom twice or constantly until then. But it’s worth the wait. Reasons That Cause Lantana to Not Bloom. Navigating the labyrinth of plant behavior can feel akin to cracking a cryptic crossword. You’re left wracking your brains for clues, each contradictory symptom acting as a riddle. Issues causing lantana to stop blooming include not enough sun, too much fertilizer, cooler temperatures, lack of pruning, water-logged soil or the lantana lace bug. why lantanawon’tbloom? by Anirban.The PROBLEM with Lantana Camara. To encourage blooming, continually deadhead lantana plants by removing faded blooms, seeds or berries throughout the blooming season from late spring until frost. A different species of Lantana is Lantana montevidensis. This is more of a spreading habit with that particular species, they also usually have more of a solid color to them, usually purple or white. This species will reach around 8 to 12 inches tall and spread from 2 to 4 foot wide. Lantana is a native to southern Texas and the tropical regions of the Americas. And as you can tell, it is well loved for its flower power all through summer, the dog days of summer, up until frost. From "Lantana montevidensis (Weeping Lantana)" in Annual Gardening by June Hudson: "The weeping lantana, from South America, is treated in much the same way as the shrub verbena. This could be the lantana plant. Lantana plants are pretty to look at, but did you know they can be dangerous, too?One of the main reasonslantana is dangerous is because it is toxic. The leaves and berries of the lantana plant contain chemicals called triterpenoids. 2.Trailing Lantana (Lantana montevidens): The blooming plant species Lantana camara, also referred to as common lantana, is indigenous to the American tropics, especially Central and South America. “The main reasonLantana is the biggest menace in Mt Kenya forests is that it prevents natural regeneration meaning that when older trees die off, Lantana thickets take over.