shrub

Tree Marigold Mexican Sunflower

Tithonia diversifolia

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Essentials

At a Glance

Plant Type

Shrub

Height

60 inches

Width

30 inches

Light

Full Sun, Partial Sun

Zones

6, 7, 8, 9

Water

Moderate once established

Humidity

Average

Lifespan

Perennial in warm climates, annual elsewhere

Native To

Mexico and Central America

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Tithonia diversifolia, also known as tree marigold or Mexican sunflower, is a fast-growing perennial often grown as an annual in cooler climates. It features large, bright orange flowers and is known for attracting pollinators. This species can grow quite tall and has a distinct tree-like form, offering a unique look in the garden compared to other flowering plants.

Bloom Period:

EarlyLate

Uses & Benefits:

Vibrant orange flowers add cheerful color to gardens and landscapes.

Drought-tolerant and low-maintenance, ideal for xeriscaping.

Provides nectar for pollinators like bees and butterflies.

Marketplace

Where to Buy

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Planting

How to Grow

Tuck seeds into well-draining soil in full sun for best germination.
Mist cuttings lightly to maintain moisture and promote root growth.
Water regularly to keep soil moist but not waterlogged.
Fertilize monthly with a balanced fertilizer during the growing season.
Prune back dead or damaged stems to encourage bushier growth.
Divide mature plants in early spring to propagate new plants.

Pro Tip

Start seeds indoors 4-6 weeks before the last frost for earlier blooms.

Keep It Thriving

Care Guide

Do

Ensure plenty of sunlight for vibrant flowering 🌞
Maintain consistent watering, especially during dry spells 💧
Apply organic compost annually to enrich soil
Prune to shape and remove dead stems
Mulch to retain soil moisture and suppress weeds

Don't

Avoid overwatering which can cause root rot ❌
Don’t fertilize late in the season to prevent weak growth
Refrain from pruning in late fall to protect winter interest

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Pinch
Plant
Stake

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Bright summer border with vibrant orange flowersWildflower meadow for a natural lookSunny roadside planting for low-maintenance color

Companion Plants

Marigolds Zinnias Cosmos Gaillardia Sunflowers

Multiply

Propagation Methods

Good to Know

Common Questions

Tree Marigold Mexican Sunflower questions

What zones can Tree Marigold Mexican Sunflower grow in?

Tree Marigold Mexican Sunflower is hardy in USDA Zones 6–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Tree Marigold Mexican Sunflower deer resistant?

Yes — Tree Marigold Mexican Sunflower is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Tree Marigold Mexican Sunflower bloom?

Tree Marigold Mexican Sunflower typically blooms in late summer through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Tree Marigold Mexican Sunflower need full sun?

Tree Marigold Mexican Sunflower does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Tree Marigold Mexican Sunflower drought tolerant?

Yes — once established (usually after the first full season), Tree Marigold Mexican Sunflower handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.