Louisiana’s March gardens thrive when you select heat-tolerant blooms that can handle sudden spring showers. Knowing the best flowers to plant in march in louisiana means choosing varieties that laugh at humidity and bloom before the summer scorch sets in. March is a transition month here, with cool mornings giving way to warm afternoons and occasional downpours.
You want flowers that can take that mix without getting leggy or rotting. The key is picking plants that establish fast and flower hard before the real heat arrives. Let’s walk through the top picks for your Louisiana garden this March.
Why March Planting Works In Louisiana
March is the sweet spot for Louisiana gardeners. The last frost usually passes by mid-March in most zones. Soil temperatures warm up enough for seeds and transplants to take root quickly.
You get longer days and stronger sunlight, which pushes growth. But the air isnt yet the oppressive blanket of June. This gives flowers a chance to build strong root systems before the stress of summer.
Rainfall in March is frequent but not constant. You’ll need to watch for heavy storms that can flatten tender seedlings. But overall, the conditions are ideal for a wide range of annuals and perennials.
Best Flowers To Plant In March In Louisiana
Here are the top performers for Louisiana’s March gardens. These flowers have been tested in local conditions and proven to deliver color through spring and into summer.
Marigolds
Marigolds are practically bulletproof in Louisiana. They love the heat and bloom nonstop from spring until the first hard freeze. Plant them in full sun for best results.
They come in shades of yellow, orange, and red. French marigolds stay compact, while African marigolds grow taller. Both types work well in beds or containers.
Marigolds also repel some garden pests. Plant them near vegetables to deter nematodes and aphids. They are low maintenance and forgiving of occasional neglect.
Zinnias
Zinnias are another heat-loving annual that thrives in Louisiana. They bloom in a rainbow of colors and attract butterflies and bees. Direct sow seeds in March for summer flowers.
They need full sun and well-drained soil. Zinnias are drought tolerant once established, but they appreciate regular watering during dry spells. Deadhead spent blooms to encourage more flowers.
Choose disease-resistant varieties like ‘Zahara’ or ‘Profusion’ to avoid powdery mildew. These hybrids hold up better in Louisiana’s humid conditions.
Petunias
Petunias are classic bedding plants that perform well in March. They come in trailing and upright forms, suitable for hanging baskets or garden beds. They bloom in nearly every color except true blue.
Plant them in full sun to partial shade. Petunias need consistent moisture but not soggy soil. Fertilize every two weeks with a balanced liquid fertilizer for continuous blooms.
In Louisiana, look for heat-tolerant series like ‘Supertunia’ or ‘Wave’. These varieties spread quickly and handle humidity better than standard petunias.
Lantana
Lantana is a tough perennial in Louisiana’s warmer zones. It blooms from spring until frost with clusters of yellow, orange, pink, or red flowers. It is extremely drought tolerant once established.
Plant lantana in full sun. It thrives in poor soil and needs little fertilizer. Too much nitrogen reduces flowering. Prune it back in late winter to encourage bushy growth.
Lantana attracts butterflies and hummingbirds. It is deer resistant and generally pest-free. Some varieties have a trailing habit, perfect for spilling over walls or containers.
Cosmos
Cosmos are easy-to-grow annuals that add airy texture to gardens. They bloom in shades of pink, white, and purple. Direct sow seeds in March for flowers by late spring.
They prefer full sun and well-drained soil. Cosmos are drought tolerant and do not need rich soil. In fact, too much fertility leads to leggy growth with fewer flowers.
Deadheading prolongs blooming. Let some flowers go to seed if you want volunteers next year. Cosmos are great for cutting gardens and attract pollinators.
Salvia
Salvia, or sage, comes in many varieties that love Louisiana’s climate. Annual salvias like ‘Victoria Blue’ bloom all summer. Perennial salvias like ‘May Night’ return year after year.
Plant salvia in full sun. They need well-drained soil and moderate water. Salvia is drought tolerant once established. Deadhead to encourage repeat blooming.
Salvia flowers attract hummingbirds and bees. They are deer resistant and have few pest problems. Use them in borders, containers, or as accent plants.
Angelonia
Angelonia, also called summer snapdragon, thrives in heat and humidity. It blooms in spikes of purple, pink, white, or red. Plant it in March for flowers through October.
It needs full sun and well-drained soil. Angelonia is drought tolerant and does not require deadheading. It is low maintenance and perfect for busy gardeners.
Angelonia works well in containers or mass plantings. It adds vertical interest to beds. The flowers have a slight grape scent, pleasant but not overpowering.
Celosia
Celosia, or cockscomb, offers unique flower shapes in bright colors. It comes in plume types and crested types. Both are heat tolerant and bloom from spring to frost.
Plant celosia in full sun. It needs fertile, well-drained soil. Water regularly but avoid overhead watering to prevent fungal diseases. Celosia is great for dried flower arrangements.
Celosia attracts butterflies and is deer resistant. It works well in borders or as a focal point in containers. The flowers hold their color for weeks.
Portulaca
Portulaca, or moss rose, is a succulent annual that loves heat and drought. It blooms in bright jewel tones and stays low to the ground. Plant it in March for summer color.
It needs full sun and sandy, well-drained soil. Portulaca is extremely drought tolerant. Overwatering causes root rot. It self-seeds readily in warm climates.
Portulaca is perfect for rock gardens, containers, or hot, dry spots. The flowers open in full sun and close at night. It attracts bees and butterflies.
Pentas
Pentas are tropical perennials that bloom nonstop in Louisiana. They produce clusters of star-shaped flowers in red, pink, purple, or white. Plant them in March for months of color.
They need full sun to partial shade. Pentas prefer moist, well-drained soil. Fertilize monthly for best performance. They are butterfly magnets, especially for swallowtails.
Pentas are tender perennials that may survive mild winters. In colder zones, treat them as annuals. They work well in borders, containers, or as bedding plants.
Bougainvillea
Bougainvillea is a tropical vine that thrives in Louisiana’s heat. It blooms in vibrant bracts of pink, red, purple, orange, or white. Plant it in March after frost danger passes.
It needs full sun and well-drained soil. Bougainvillea is drought tolerant once established. It blooms best when slightly root-bound. Prune after flowering to control size.
Bougainvillea can be grown in containers or trained on trellises. It is not frost hardy, so protect it in winter. In warmer zones, it can be planted in the ground.
Hibiscus
Hibiscus, both tropical and hardy types, bloom spectacularly in Louisiana. They produce large, showy flowers in many colors. Plant them in March for summer displays.
They need full sun and rich, moist soil. Hibiscus are heavy feeders, so fertilize regularly. They attract hummingbirds and butterflies. Prune in late winter to shape.
Tropical hibiscus are not frost hardy and need winter protection. Hardy hibiscus die back to the ground and return in spring. Both types are worth the effort.
Plumbago
Plumbago is a sprawling shrub with clusters of blue flowers. It blooms from spring to frost in Louisiana. It is heat tolerant and low maintenance.
Plant plumbago in full sun to partial shade. It needs well-drained soil and moderate water. Prune it back in late winter to control size. It attracts butterflies.
Plumbago is deer resistant and generally pest-free. Use it as a ground cover, in borders, or in containers. The blue flowers are a rare color in the garden.
Gomphrena
Gomphrena, or globe amaranth, is a heat-loving annual with clover-like flowers. It blooms in purple, pink, white, or red. Plant it in March for flowers until frost.
It needs full sun and well-drained soil. Gomphrena is drought tolerant and does not need deadheading. The flowers are excellent for dried arrangements.
Gomphrena attracts butterflies and is deer resistant. It works well in borders, containers, or as a cut flower. It is one of the easiest flowers to grow.
Cleome
Cleome, or spider flower, adds height and drama to gardens. It blooms in pink, purple, or white. Direct sow seeds in March for summer flowers.
It needs full sun and well-drained soil. Cleome is drought tolerant and self-seeds readily. It can grow 3-5 feet tall, so place it at the back of borders.
Cleome attracts hummingbirds and butterflies. It has a unique, airy look. The flowers have a slight scent that some find unpleasant, so plant it away from seating areas.
How To Plant Flowers In March In Louisiana
Follow these steps for successful March planting in Louisiana. The weather can be unpredictable, so preparation matters.
- Prepare the soil by tilling or digging to a depth of 8-10 inches. Mix in 2-3 inches of compost or aged manure.
- Test the soil pH. Most flowers prefer a pH between 6.0 and 7.0. Adjust with lime or sulfur if needed.
- Choose a sunny spot. Most flowering plants need at least 6 hours of direct sunlight daily.
- Space plants according to their mature size. Overcrowding leads to poor air circulation and disease.
- Water thoroughly after planting. Keep the soil consistently moist for the first two weeks.
- Apply a 2-inch layer of mulch to retain moisture and suppress weeds. Use pine straw, bark, or shredded leaves.
- Fertilize with a balanced slow-release fertilizer at planting time. Follow package directions for rates.
Dealing With Louisiana’s March Weather
March in Louisiana can bring cold snaps, heavy rain, and sudden heat. Be prepared to protect your plants.
- Watch the forecast for late frosts. Cover tender plants with row covers or sheets if temperatures drop below 40°F.
- Ensure good drainage to prevent root rot. Raised beds help in heavy clay soils.
- Stake tall flowers like cosmos and cleome to prevent wind damage.
- Water deeply but infrequently to encourage deep roots. Adjust based on rainfall.
- Remove weeds regularly to reduce competition for water and nutrients.
Maintaining Your March-Planted Flowers
Once your flowers are in the ground, consistent care keeps them blooming. Here is what to focus on.
Watering
Water deeply once or twice a week, depending on rainfall. Louisiana’s clay soils hold moisture, so check soil moisture before watering. Stick your finger an inch into the soil; if it feels dry, water.
Water at the base of plants to avoid wetting foliage. This reduces fungal diseases. Early morning watering is best to allow leaves to dry during the day.
Fertilizing
Feed flowers every 4-6 weeks with a balanced fertilizer. Use a 10-10-10 or 20-20-20 formula. Follow package directions. Over-fertilizing leads to lush foliage but fewer flowers.
For continuous bloomers like petunias and zinnias, use a high-phosphorus fertilizer to promote flowering. Liquid fertilizers are easy to apply and fast-acting.
Deadheading
Remove spent flowers regularly to encourage more blooms. This is especially important for marigolds, zinnias, and petunias. Use clean pruners or simply pinch off the old flowers.
Some flowers, like lantana and angelonia, do not need deadheading. They drop their old flowers naturally. Check each plant’s needs to save time.
Pest And Disease Control
Louisiana’s humidity encourages pests and diseases. Monitor your plants weekly for signs of trouble.
- Aphids: Spray with a strong stream of water or use insecticidal soap.
- Spider mites: Increase humidity around plants or use miticides.
- Powdery mildew: Ensure good air circulation and avoid overhead watering.
- Slugs and snails: Use beer traps or diatomaceous earth around plants.
Companion Planting For March Flowers
Pairing flowers with compatible plants improves growth and reduces pests. Here are some effective combinations.
- Marigolds with tomatoes: Marigolds repel nematodes and aphids.
- Zinnias with cucumbers: Zinnias attract pollinators for better fruit set.
- Petunias with beans: Petunias deter bean beetles.
- Lantana with citrus: Lantana attracts beneficial insects that prey on citrus pests.
- Cosmos with peppers: Cosmos attract parasitic wasps that control hornworms.
Common Mistakes To Avoid
Even experienced gardeners make errors in March. Avoid these common pitfalls.
- Planting too early: Wait until after the last frost date for your zone.
- Overwatering: Louisiana’s clay soils drain slowly. Let the soil dry between waterings.
- Skipping soil preparation: Poor soil leads to weak plants. Always amend with compost.
- Ignoring spacing: Crowded plants compete for resources and are more disease-prone.
- Forgetting mulch: Mulch conserves moisture and regulates soil temperature.
Frequently Asked Questions
What Are The Best Flowers To Plant In March In Louisiana For Full Sun?
Marigolds, zinnias, lantana, cosmos, and salvia are excellent choices for full sun. They thrive in heat and bloom profusely.
Can I plant perennials in March in Louisiana?
Yes, March is a good time to plant perennials like lantana, plumbago, and hardy hibiscus. They establish before summer heat.
How often should I water new flowers in March?
Water new plants daily for the first week, then every 2-3 days for the next two weeks. After that, water deeply once a week if there is no rain.
What flowers bloom all summer in Louisiana?
Lantana, angelonia, pentas, gomphrena, and bougainvillea bloom from spring until frost. They are heat tolerant and low maintenance.
Should I use seeds or transplants for March planting?
Transplants give you a head start and are easier for beginners. Seeds are cheaper and work well for fast-growing flowers like zinnias and cosmos.
Final Tips For March Gardening In Louisiana
March is a busy month in the garden, but the rewards are worth it. Start with a plan and stick to a routine. Visit your garden daily to catch problems early.
Group plants with similar water and sun needs together. This simplifies care and reduces waste. Keep a garden journal to track what works and what doesn’t.
Dont be afraid to try new varieties each year. Louisiana’s climate supports a wide range of flowers. Experiment and find your favorites.
Remember that gardening is a learning process. Some plants will thrive, others will struggle. Each season teaches you something new.
With the right choices and care, your March-planted flowers will provide color and joy through the long Louisiana summer. Enjoy the process and the beauty it brings.