Benary's Giant

Zinnia

75d to harvest

A riot of color from a single bloom—Benary’s Giant zinnias open with bold, velvety petals that feel plush to the eye and glow in the garden like stained glass. Expect sturdy, upright stems and large, fully double flowers that hold their form beautifully, making them ideal for standout cut-flower bouquets. With a long season of bloom and pollinator-friendly appeal, this is the zinnia to grow when you want maximum impact and nonstop floral drama from midsummer onward.

Crop Dates

Milestone	Date
Start Indoors	Apr 10th
Last Frost	May 8th
Transplant / Sow Outdoors	May 8th
Harvest Begins	Jul 22nd
Harvest Ends	Sep 30th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	45
Harden Off (days)	7

Frequently Asked Questions

What’s a common disease problem for Zinnia elegans (Benary’s Giant), and how can I treat it?

Zinnia elegans commonly suffers from powdery mildew, which shows up as a white, dusty coating on leaves during warm, humid periods. Improve airflow by spacing plants properly and watering at the soil line (not overhead), then remove heavily affected leaves. If it’s spreading, apply a labeled fungicide for powdery mildew on zinnias and repeat according to the label interval.

How often should I water Benary’s Giant zinnias during the main growing phase?

During active growth and flowering, keep the soil consistently lightly moist—about 1 inch of water per week total, adjusted for rainfall. Water deeply when the top 1 inch of soil feels dry, and avoid frequent light sprinkling that keeps foliage wet. In full sun, this usually means watering 1–2 times per week depending on heat and soil texture.

How do I know when Benary’s Giant zinnia flowers are ready to harvest?

Harvest when the flower heads are fully colored and the petals are flat and crisp, with the center fully developed but not breaking down. For best vase life, cut stems in the morning and pick blooms before they start to look ragged or watery. If you’re harvesting for continuous flowering, snip spent blooms promptly to encourage more buds.