Maximilian Sunflower

Name: Maximilian Sunflower
Brand: Outdoor Dream Builders

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

💧Watering

Water deeply every 1-2 weeks through the growing season to fuel its tall growth; it wilts and stays short if kept too dry.

✂️Pruning

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.

🌱Fertilizing

Little needed in decent soil; a spring feed can support the fast, tall growth if the soil is very lean.

🛡️Pests

Occasional aphids and powdery mildew on crowded foliage — space plants and improve airflow to prevent it.

☀️Seasonal Notes

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

🪨Soil

Adaptable to most desert soils including clay and lean ground; grows tallest in deeper, better soil with some moisture.

💧Drainage

Needs moderate soil.

🌱Nutrient Needs

Low feeder.

🌰Propagation

Division of the spreading rhizomatous clump every few years, or seed; it also self-sows.

📐Spacing

2–3 ft

🌳Roots & Placement

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.