
Mexican Sunflower
Tithonia rotundifolia
Grow Time
90-120 days
Sunlight
Full Sun
Watering
Every 5-7 days
Toxicity
Non-toxic
Video content from YouTube
Watch on YouTubeHow to plant Mexican Sunflower: Step-by-Step Guide
Growing Guide
Preparation

What you'll need:

Mexican Sunflower seeds (you can find them at garden centers or online)

A sunny spot in your garden or large pots (at least 12 inches wide)

Regular potting soil or garden soil

Basic gardening tools like a trowel and watering can
When to start:
Mexican Sunflowers love warmth, so the best time to plant is after the last frost in spring when the soil has warmed up. If you live in a cooler climate, you can start the seeds indoors about 4-6 weeks before the last expected frost.
Choosing a good spot:
These flowers thrive in full sun, so pick a location that gets at least 6-8 hours of direct sunlight each day. They also prefer well-draining soil, so if your garden soil is heavy or clay-like, consider mixing in some sand or compost to improve drainage.
Tip: If planting in pots, make sure they have drainage holes to prevent waterlogging.
Planting

If you have seeds:
- Sow the seeds directly into the ground or pots where you want them to grow.
- Place the seeds about ¼ inch deep in the soil and cover them lightly.
- Space the seeds about 18-24 inches apart to give the plants room to grow.
- Water gently but thoroughly to keep the soil moist while the seeds germinate.
- Seeds should sprout within 7-14 days.
If you have seedlings:
- Dig a hole slightly larger than the root ball of the seedling.
- Place the seedling in the hole, ensuring the top of the root ball is level with the soil surface.
- Fill in around the seedling with soil and gently firm it down.
- Water the seedling well after planting.
Planting tips:
- If starting indoors, use small pots or seed trays and transplant the seedlings outdoors after the danger of frost has passed.
- Handle the seedlings carefully to avoid damaging their roots during transplanting.
Growing Care





Watering:
- Mexican Sunflowers are drought-tolerant once established, but they need regular watering when young.
- Water deeply once or twice a week, depending on rainfall and temperature.
- Allow the soil to dry out between waterings to prevent root rot.
Feeding:
- These plants don’t need much fertilizer. You can add a bit of compost or slow-release fertilizer when planting.
- Avoid over-fertilizing as this can lead to lush foliage but fewer flowers.
Supporting:
- Mexican Sunflowers can grow tall (up to 6 feet) and may need staking in windy areas.
- Use bamboo stakes or garden supports to keep the plants upright.
Pruning:
- Deadhead spent flowers regularly to encourage more blooms.
- You can also pinch back young plants to promote bushier growth, although they naturally branch well.
Pest and Disease Control:
- Mexican Sunflowers are generally pest-free, but keep an eye out for aphids or spider mites.
- If you notice pests, spray the plants with a strong jet of water or use insecticidal soap.
Harvesting

When to enjoy your flowers:
- Mexican Sunflowers bloom from mid-summer to the first frost.
- The vibrant orange-red flowers are perfect for cutting and adding to bouquets.
- Harvest flowers in the morning when they are fully open and fresh.
How to cut flowers:
- Use clean, sharp scissors or pruners to cut the flower stems.
- Cut the stems at an angle to help them absorb water better.
- Remove any leaves that would be submerged in the vase water.
Arranging your bouquet:
- Place the freshly cut flowers in a vase with lukewarm water.
- Change the water every few days to keep the flowers fresh longer.
- Enjoy the bright, cheerful blooms in your home!
Tip: Cutting flowers regularly will encourage more blooms throughout the season.
Plant Care FAQ
Q: How tall do Mexican Sunflowers grow?
A: They can reach heights of 4-6 feet, so make sure to give them enough space and possibly some support if needed.
Q: Do Mexican Sunflowers attract pollinators?
A: Absolutely! They are a favorite of bees, butterflies, and hummingbirds, making them a great addition to any pollinator-friendly garden.
Q: Can I grow Mexican Sunflowers in containers?
A: Yes, but choose a large container (at least 12 inches wide) and ensure it has good drainage. Keep in mind they might not grow as tall as in the ground.
Q: Are Mexican Sunflowers invasive?
A: No, they are annuals and will not come back next year unless you let them self-seed. However, they can spread seeds quite effectively, so deadhead spent flowers if you want to control their spread.
Q: My Mexican Sunflowers are wilting, what should I do?
A: Check if the soil is too dry or too wet. Adjust your watering accordingly. Ensure the plants are getting enough sunlight and check for signs of pests or diseases.
Pro Tips
1. Companion Planting
Plant Mexican Sunflowers near vegetable gardens to attract beneficial insects and pollinators, which can help increase your harvest.2. Natural Pest Deterrent
Their strong scent can help deter certain pests, making them useful as a border plant.3. Easy Seed Collection
Allow a few flowers to go to seed at the end of the season. Collect the seeds to plant next year or let them self-seed for new plants.4. Wind Protection
If you live in a windy area, plant Mexican Sunflowers near a fence or wall to provide some shelter and prevent them from breaking.5. Low Maintenance Beauty
Once established, these flowers require minimal care and are perfect for busy gardeners who still want a stunning display.6. Season Extension
To extend the blooming period, remove spent flowers regularly to encourage continuous blooming until the first frost.7. Garden Design Tip
Use Mexican Sunflowers as a backdrop in garden beds due to their height, creating a beautiful contrast with shorter plants in front.