Lantana is a tropical American shrub that thrives in hot, sunny weather and rarely suffers from summer heat in a garden.1Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms Cold is its real limit, since it tolerates only very light frost.2Hearst Newspapers. Will Lantana Come Back After a Freeze? In mild-winter areas a hard freeze usually costs you the top growth, not the whole plant, which is why a frost-blackened lantana is often still alive.
How Cold Lantana Can Get Before It Dies Back
A brief dip to freezing may only scorch some leaves.3Hearst Newspapers. Will Lantana Come Back After a Freeze? At 28°F or below, though, lantana dies back to the ground, meaning all the stems above the soil are killed.4Hearst Newspapers. Will Lantana Come Back After a Freeze? Leaves chilled to about 23°F (−5°C) suffer permanent damage.5Russian Journal of Plant Physiology. Effect of low and high temperatures on the photosynthetic performance of Lantana camara L. Leaves in darkness
Prolonged freezing kills the woody branches and strips off the leaves.6PubMed Central. Climate Change and the Potential Distribution of an Invasive Shrub, Lantana camara L Lantana seldom grows wild where temperatures often fall below 41°F (5°C),7PubMed Central. Climate Change and the Potential Distribution of an Invasive Shrub, Lantana camara L so a run of chilly weeks stresses the plant even without a hard freeze.
The morning after a frost, leaves turn black or brown and go limp within a day or two. Stems that froze through look dry and brittle rather than green. Damage is usually worst on the top and outer branches, and a plant growing against a warm wall may show less of it.
Forecast lows can mislead. A yard in a low spot or open ground can run several degrees colder than the number you heard, and a clear, still night lets frost form on leaves even when the air stays above 32°F. A garden thermometer placed near the plant gives a truer reading.
Before a freeze, water the soil a day ahead, since moist soil holds heat better than dry soil. Cover the plant all the way to the ground with frost cloth or an old sheet, not plastic touching the leaves, and mulch the base to shield the roots. Move potted lantana into a garage or indoors.
A “light frost” forecast can still hurt a container plant. A pot has no surrounding ground to hold warmth, so its roots and soil cool far faster than in-ground roots, and a pot on a patio table is more exposed than the same plant in a bed. If you can’t move a pot, push it against a house wall or group it with other pots, because the shared mass and the wall’s radiated heat soften the night’s low.
A cover works by holding in warmth rising from the soil, so it only helps if it reaches the ground all around the plant instead of hanging like a hat. Lift it off in the morning once temperatures climb above freezing, because a cover left on in sun can trap heat and moisture against the leaves.
Will Lantana Come Back After a Freeze
Dying back to the ground kills the top, but the roots below the soil are what regrow the plant.8Hearst Newspapers. Will Lantana Come Back After a Freeze? In areas where it is hardy, lantana usually sprouts again from the base in spring, and it grows very fast once the weather warms.9Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms
To check a frozen plant, scratch a stem with a fingernail. Green and moist underneath means living tissue. Work downward until you find green, since the base often survives when the tips don’t. If there’s no green at the soil line by late spring, the roots probably died too.
Frost-blackened foliage can look dead for weeks, so wait and check rather than dig the plant out. In a mild-winter area, a lantana frozen in December often sits as bare sticks through January and February, which is normal.
New shoots often appear only after the soil warms, later than on other shrubs, and pulling a plant in early spring can throw away a living root. Green shoots near the soil line are the first real sign of recovery. Potted plants left outside are less likely to recover because pot soil can freeze through.
Leave the dead stems in place over winter, since they can shield the crown from further cold. Cut them once new growth shows where the live wood begins.
What decides survival is whether the root zone froze, not just how low the air dipped for one night. A brief hard freeze is much less dangerous than several days of frozen ground. A thick layer of mulch piled over the base in late fall keeps soil temperatures steadier, and plants in well-drained soil tend to come through better than those in soggy ground, because cold wet soil is hard on roots. After a very harsh winter, expect the plant to regrow smaller and slower than usual, even when it does recover.
Where Lantana Survives Winter Outdoors
Lantana is hardy in USDA zones 8 to 11. In zones 8 and 9, expect it to freeze back in some winters and regrow. In cooler-winter places such as Tucson it drops some or all of its leaves,10Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms so a bare plant in winter there is normal, not dead.11Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms
A lantana at the cold edge of its range, such as zone 8, will sometimes be killed to the ground and sometimes lose only leaves, depending on the winter. Gardeners in zone 8 often mulch the base each fall as cheap insurance for the roots.
Below zone 8, outdoor lantana usually does not survive winter. Gardeners there grow it as a summer annual or keep it in a pot to bring inside.
To overwinter a pot, bring it in before nights drop near freezing. A cool, bright room or a garage window keeps it semi-dormant. Water lightly, only when the soil dries, and expect some leaf drop and leggy growth.
You can look up your zone by zip code on the USDA map. South-facing walls and paved areas create warmer pockets, and zone 7 gardeners sometimes get plants through mild winters in such spots.
How Much Heat Lantana Can Handle
Lantana grows fast and handles desert summer heat such as Tucson’s.12Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms Leaves heated to about 117°F (47.5°C) or more suffer permanent damage,13Russian Journal of Plant Physiology. Effect of low and high temperatures on the photosynthetic performance of Lantana camara L. Leaves in darkness and leaf surfaces in full sun on pavement can approach that in the worst heat waves. Normal summers stay well below it. In both very hot and very cold weather, lantana boosts protective chemicals that limit damage inside its leaves.14Russian Journal of Plant Physiology. Involvement of Boiling Stable Antioxidant Enzymes in Adaptation of Invasive Alien Plant Lantana to Abiotic Stress under Natural Conditions15Russian Journal of Biological Invasions. Protective role of boiling stable antioxidant enzymes in invasive alien species of Lantana exposed to natural abiotic stress like conditions
Afternoon wilting that recovers by evening is usually normal. Crisp brown leaf edges signal real stress. Flowering often slows in the hottest weeks and returns as things cool.
In a heat wave, water deeply but less often, since established plants dislike soggy roots. Mulch keeps roots cooler. Potted plants dry out fastest and may need water daily, and afternoon shade for pots on hot patios reduces leaf scorch.
Feel the soil a few inches down before adding water. A plant that droops with wet soil may be overwatered, and yellowing leaves with constantly damp soil point to too much water rather than too much heat. New transplants have small root systems and are the most likely to struggle, so they need more frequent watering until established.
Pavement matters too. A lantana beside a driveway, south-facing wall, or patio gets heat from the surface as well as the sun, so it can be hotter than the air temperature suggests. Pots on concrete heat from underneath, and dark containers absorb more heat, so a light-colored pot or one set on bricks or a stand keeps roots cooler. A plant in a bed with open soil around it is usually less stressed than one wedged against hot paving.
Pruning Lantana Around Winter
Some landscapers cut lantana hard to 6 to 12 inches in November.16Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms A light trim in November with the main prune in March is a gentler approach.17Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms Wait to prune hard until frost danger has passed and nights stay above about 38 to 40°F,18Joy Us Garden. Pruning Lantana: Key Tips For Healthy Plants & Abundant Blooms because fresh cuts push tender new shoots that a late frost can kill. A hard fall cut also removes the dead-looking stems that were insulating the crown, leaving the base more exposed to winter cold.
For the spring prune, remove dead and frozen stems first. Then cut healthy stems back by about a third to two thirds to shape the plant, using clean, sharp pruners. Feed and water lightly once growth resumes.
Look up your area’s average last frost date, but treat it as an estimate, since frosts do sometimes come after it. Watch the ten-day forecast and wait until nights are steadily above the 38 to 40°F range before cutting hard. Waiting a few extra weeks costs little because lantana regrows quickly.
Are Some Lantanas More Cold Hardy
Among trailing lantanas tested in Florida, the Australian trailing type was smaller and more sensitive to cold than other varieties.19HortScience. Landscape Performance, Flowering, and Female Fertility of Eight Trailing Lantana Varieties Grown in Central and Northern Florida It also produced abundant viable seed.20HortScience. Landscape Performance, Flowering, and Female Fertility of Eight Trailing Lantana Varieties Grown in Central and Northern Florida In borderline zones, choose a variety labeled for your zone and ask a local nursery.
Tags and nursery listings often give a hardiness zone. For a borderline site, pick a variety rated for your zone or colder, not one rated exactly at your limit. A tag that lists no zone or calls the plant an annual suggests you shouldn’t count on it surviving a freeze. Nursery staff who sell locally know which varieties have come through nearby winters, which is more reliable than general descriptions. Larger shrub types with woody bases often regrow more reliably.
Small rooted cuttings and new transplants are more easily hurt by chilly weather than established plants. Plant after frost danger so the roots can establish before the next winter.