Maximilian Sunflower
Helianthus maximiliani
A towering native sunflower whose golden fall spires provide a feast for butterflies and seed-loving birds.
Hardy in USDA zones 4-9 and adaptable to the low desert; fully winter-dormant, dying to the ground in cold and returning each spring, best with a little extra water in the hottest zones.
AMWUA Notes
A vigorous, spreading perennial that trades a bit more water for a towering fall bloom and abundant bird seed.
Care Guide
Water deeply every 1-2 weeks through the growing season to fuel its tall growth; it wilts and stays short if kept too dry.
Pinch or cut stems back by a third in early summer to reduce ultimate height and prevent flopping; cut the whole clump to the ground after fall bloom finishes.
Little needed in decent soil; a spring feed can support the fast, tall growth if the soil is very lean.
Occasional aphids and powdery mildew on crowded foliage — space plants and improve airflow to prevent it.
Herbaceous and winter-dormant; it spreads by rhizomes into a large clump, so divide every few years to keep it in bounds. Leave seed heads standing for birds.
Soil, Feeding & Propagation
Adaptable to most desert soils including clay and lean ground; grows tallest in deeper, better soil with some moisture.
Needs moderate soil.
Low feeder.
Division of the spreading rhizomatous clump every few years, or seed; it also self-sows.
2–3 ft
Spreads aggressively by rhizomes into large clumps; divide regularly to keep it in bounds. Not a taproot.
Placement Tips
- •Place at the back of borders or as a seasonal screen where its 10-foot fall spires provide a dramatic backdrop.
- •Give it room and possibly staking; group several for a bold late-season wall of gold.
- •Leave the seed heads through winter as a bird feeder before cutting back.
- •Site away from paths since it can lean; full sun keeps it sturdiest.
Features
Best Uses
Ecological Value
Attracts
Wildlife Value
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Maximilian Sunflower. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Maximilian Sunflower — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Maximilian Sunflower need in Phoenix?
Maximilian Sunflower is a moderate-water perennial once established. Water deeply every 1-2 weeks through the growing season to fuel its tall growth; it wilts and stays short if kept too dry. A vigorous, spreading perennial that trades a bit more water for a towering fall bloom and abundant bird seed.
How big does Maximilian Sunflower get?
Expect roughly 10 ft tall and 2 ft wide at maturity, with a fast growth rate. Allow about 2–3 ft of spacing when planting. Spreads aggressively by rhizomes into large clumps; divide regularly to keep it in bounds. Not a taproot.
Can you plant Maximilian Sunflower near a pool?
Yes. Maximilian Sunflower is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated low.
Can Maximilian Sunflower handle Arizona heat and winter frost?
Maximilian Sunflower is hardy in USDA 9-11 and wants full sun. Hardy in USDA zones 4-9 and adaptable to the low desert; fully winter-dormant, dying to the ground in cold and returning each spring, best with a little extra water in the hottest zones. Herbaceous and winter-dormant; it spreads by rhizomes into a large clump, so divide every few years to keep it in bounds. Leave seed heads standing for birds.
Does Maximilian Sunflower have thorns?
No. Maximilian Sunflower is thornless, so it is safe alongside walkways, patios and play areas.
Is Maximilian Sunflower safe around pets?
Maximilian Sunflower is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Maximilian Sunflower bloom in Arizona?
Maximilian Sunflower blooms in fall, with yellow flowers. The bloom draws butterflies.
How much maintenance does Maximilian Sunflower need?
Maximilian Sunflower is low-maintenance. Leaf, flower and pod litter is rated low. Pinch or cut stems back by a third in early summer to reduce ultimate height and prevent flopping; cut the whole clump to the ground after fall bloom finishes.
What kind of soil does Maximilian Sunflower need?
Adaptable to most desert soils including clay and lean ground; grows tallest in deeper, better soil with some moisture. Nutrient needs are low. Little needed in decent soil; a spring feed can support the fast, tall growth if the soil is very lean.
Is Maximilian Sunflower native to Arizona?
No. Maximilian Sunflower is not an Arizona native; it originates from the North America, but it is grown successfully in low-desert landscapes here.