Arizona’s March sun calls for flowers that thrive in intense desert light with minimal water needs. If you’re searching for the best flowers to plant in march in arizona, you need varieties that handle heat, dry soil, and sudden temperature swings. March is a prime planting window here because the risk of frost is mostly gone, but summer’s scorch hasn’t arrived yet. This guide covers exactly what to put in the ground now for color that lasts through May and beyond.
You don’t need a green thumb to succeed. Just pick the right plants and follow a few simple steps. Let’s get started with the top picks for your Arizona garden this March.
Best Flowers To Plant In March In Arizona
These flowers are proven winners for Arizona’s unique climate. They laugh at the heat and ask for very little water once established. Each one brings bold color and texture to your landscape.
Marigolds: Reliable Heat-Loving Annuals
Marigolds are a no-brainer for March planting. They germinate fast and bloom nonstop until November. The orange and yellow flowers attract pollinators and repel some pests.
- Plant seeds directly in the soil after the last frost date
- Space them 6-12 inches apart for good air flow
- Water deeply once a week, not daily
- Deadhead spent blooms to encourage more flowers
Marigolds handle Arizona’s alkaline soil well. They don’t need rich compost or fancy fertilizers. Just give them full sun and watch them go.
Zinnias: Drought-Tolerant Color Machines
Zinnias are another top choice for March. They come in every color except true blue. The flowers are great for cutting and bringing indoors.
- Choose a sunny spot with well-draining soil
- Sow seeds 1/4 inch deep and cover lightly
- Thin seedlings to 6-12 inches apart once they sprout
- Water at the base to avoid powdery mildew
Zinnias attract butterflies like crazy. They also handle the dry air of Arizona without drooping. For the best show, plant a mix of tall and dwarf varieties.
Portulaca: The Succulent-Like Ground Cover
Portulaca, also called moss rose, thrives in poor soil and full sun. Its fleshy leaves store water, so it laughs at drought. The flowers open in the morning and close at night.
- Plant from nursery starts for quicker results
- Space them 8-10 inches apart for spreading
- Water only when the soil feels dry an inch down
- Use in rock gardens, containers, or along walkways
Portulaca comes in pink, red, yellow, orange, and white. It blooms from March all the way through October with almost no care.
Lantana: Perennial Power For Desert Gardens
Lantana is a woody perennial that returns year after year in Arizona. It handles heat, wind, and neglect. The flower clusters are small but abundant, drawing hummingbirds and butterflies.
- Plant in full sun for the most blooms
- Space 2-3 feet apart for mature spread
- Water deeply every 7-10 days once established
- Prune in late winter to shape and encourage growth
Lantana comes in trailing and upright forms. The trailing types work great in hanging baskets. Upright varieties make nice low hedges or borders.
Gazanias: African Daisies For Hot Spots
Gazanias love the Arizona sun. Their daisy-like flowers close at night and on cloudy days. The foliage is silvery-green, adding texture even when not in bloom.
- Plant in well-draining soil, even sandy or rocky
- Space 12-15 inches apart for ground cover effect
- Water sparingly, letting the soil dry between waterings
- Remove spent flowers to keep them blooming
Gazanias come in shades of yellow, orange, pink, and red. They’re perfect for slopes where water runs off quickly.
Cosmos: Easy Annuals From Seed
Cosmos are some of the easiest flowers to grow from seed. They tolerate poor soil and bloom until frost. The delicate foliage and tall stems add airy movement to the garden.
- Sow seeds directly in March after soil warms
- Press seeds lightly into the soil, don’t bury deep
- Thin to 12-18 inches apart for strong stems
- Water only during dry spells, they prefer lean conditions
Cosmos come in pink, white, purple, and orange. They self-sow readily, so you’ll get volunteers next year.
Sunflowers: Tall And Cheerful
Sunflowers are a March must-plant in Arizona. They grow fast and make a big statement. The seeds are easy to handle and kids love planting them.
- Plant seeds 1 inch deep in full sun
- Space 6-12 inches apart for smaller varieties, 24 inches for giants
- Water deeply once a week, more if in containers
- Stake tall varieties if wind is a problem
Sunflowers attract bees and birds. The seeds from mature heads are edible too. Choose branching types for more flowers per plant.
Verbena: Trailing Color For Containers
Verbena is a low-growing plant that spills over pot edges. It blooms in clusters of small flowers from March to November. The purple, pink, and red shades are vibrant.
- Plant in containers or hanging baskets for best effect
- Use well-draining potting mix, not garden soil
- Water when the top inch of soil feels dry
- Fertilize monthly with a balanced liquid feed
Verbena also works as a ground cover in small areas. It spreads but isn’t invasive.
Penstemon: Native Beauty For Low Water Gardens
Penstemon, or beardtongue, is a native Arizona plant. It’s adapted to our climate and needs very little water. The tubular flowers come in red, pink, purple, and white.
- Plant in fall or early spring for best root growth
- Space 12-18 inches apart in full sun
- Water deeply every 10-14 days once established
- Cut back after blooming to encourage rebloom
Penstemon attracts hummingbirds like a magnet. It’s perfect for xeriscape gardens and slopes.
Blanket Flower (Gaillardia): Long-Blooming Perennial
Blanket flower is a tough perennial for hot, dry spots. Its daisy-like flowers are red and yellow, like a Mexican blanket. It blooms from March to October with deadheading.
- Plant in full sun with good drainage
- Space 12-18 inches apart
- Water deeply but infrequently
- Divide every 2-3 years to keep plants vigorous
Blanket flower is deer resistant and drought tolerant. It’s a great choice for beginner gardeners.
How To Prepare Your Arizona Garden For March Planting
Before you put any seeds or plants in the ground, take a few steps to set them up for success. Arizona soil can be tough, but a little prep goes a long way.
Test Your Soil Drainage
Most Arizona soil is clay or caliche, which drains poorly. Dig a hole 12 inches deep and fill it with water. If it’s still standing after 24 hours, you need to amend the soil.
- Mix in compost or aged manure to improve drainage
- Add gypsum to break up heavy clay
- Raised beds are a great option for poor soil
Choose The Right Location
March sun is strong but not as harsh as June. Still, most flowers need at least 6 hours of direct sun. Watch your yard for a few days to see where the sun hits.
- South and west exposures are hottest
- East exposures get morning sun, which is gentler
- North exposures are too shady for most flowers
Water Wisely From Day One
New plants need more water at first, then you can cut back. Overwatering is a common mistake in Arizona. It leads to root rot and fungus.
- Water new seeds daily until they sprout
- Water transplants every 2-3 days for the first two weeks
- After that, water deeply once a week
- Water in the morning to reduce evaporation
Common Mistakes When Planting Flowers In March In Arizona
Even experienced gardeners make errors. Here are the most common ones and how to avoid them.
Planting Too Early
March can still have cold snaps. Check your local frost dates. In higher elevations like Flagstaff, wait until April. In Phoenix or Tucson, mid-March is usually safe.
Overwatering
Arizona’s dry air makes you think plants need constant water. But most flowers prefer deep, infrequent watering. Let the soil dry between waterings.
Skipping Mulch
Mulch keeps soil cool and moist. Use a 2-3 inch layer of organic mulch like wood chips or straw. It also prevents weeds.
Ignoring Wind
March winds can be strong in Arizona. Stake tall plants like sunflowers and cosmos. Use windbreaks for tender seedlings.
Best Flowers For Shade In Arizona March Planting
Not every yard gets full sun. If you have shade, these flowers still work for March planting.
Impatiens
Impatiens love shade and bloom nonstop. They need more water than sun lovers. Plant them in containers or under trees.
Begonias
Wax begonias handle part shade well. They have waxy leaves that resist drying out. The small flowers come in pink, red, and white.
Coleus
Coleus is grown for its colorful leaves, not flowers. It thrives in shade and adds bold color. Pinch back stems to keep plants bushy.
Flowers To Avoid Planting In March In Arizona
Some flowers just don’t work for March planting here. Save these for fall or winter.
- Pansies and violas prefer cool weather, they’ll bolt in heat
- Petunias can handle some heat but often struggle in Arizona’s intense sun
- Snapdragons do better in fall for spring bloom
- Dianthus prefers cooler temperatures and shorter days
Stick with the heat-tolerant list above for best results.
Frequently Asked Questions
Can I plant flowers in March in Arizona if I live in the mountains?
Yes, but wait until late March or early April. Higher elevations have later frost dates. Choose cold-tolerant varieties like pansies or snapdragons for mountain areas.
What is the easiest flower to grow from seed in Arizona in March?
Marigolds and zinnias are the easiest. They germinate quickly and grow fast. Direct sow them after the soil warms up.
How often should I water new flower plants in March in Arizona?
Water new transplants every 2-3 days for the first two weeks. After that, water deeply once a week. Adjust based on rainfall and temperature.
Do I need to fertilize flowers planted in March in Arizona?
Light fertilization helps. Use a balanced, slow-release fertilizer at planting time. Avoid high-nitrogen formulas that promote leaves over flowers.
Can I plant flowers in containers in March in Arizona?
Absolutely. Containers warm up faster than ground soil. Use a quality potting mix and ensure drainage holes. Water container plants more often than in-ground ones.
Final Tips For March Flower Planting In Arizona
Start small if you’re new to gardening. Pick two or three flower types from this list and see how they do. You can always add more next year.
Keep an eye on the weather. If a late frost is predicted, cover young plants with a sheet or frost cloth. Remove it in the morning.
Enjoy the process. Arizona’s March sun is a gift for gardeners. With the right flowers, your yard will be full of color before you know it.