Zinnia

Zone 5b Save Garden

🌱 60d to harvest Upright

Sunlight seems to pour straight through Zinnia’s petals—bold, saturated blooms with a velvety, layered look that holds its color …

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 4th
Transplant / Sow Outdoors	May 4th
Harvest Begins	Jul 3rd
Harvest Ends	Oct 5th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	75
Min Soil Temp (°F)	70
Min Night Temp (°F)	50
Harden Off (days)	Not Required

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Frequently Asked Questions

Why are my Zinnia elegans leaves turning yellow and spots showing up, and what should I do?

Zinnia elegans commonly develops powdery mildew and leaf-spot issues, especially when foliage stays wet or air movement is poor. Water at the soil line, space plants so they don’t crowd, and remove the worst affected leaves to slow spread. If it’s actively spreading, spray with a labeled fungicide for powdery mildew/leaf spot and reapply according to the label (often every 7–14 days).

How often should I water Zinnia elegans during the main growing phase?

During active growth (about weeks 2–6), keep the soil evenly moist but not soggy—about 1 inch of water per week total, split if temperatures are very hot. Water deeply when the top 1 inch of soil feels dry, and avoid wetting the leaves to prevent mildew. Once plants are established, let the top layer dry slightly between waterings to keep roots healthy.

When is Zinnia elegans ready to harvest for cut flowers?

Harvest when the flower head is fully colored and the outer ray florets are fully expanded, with the central disk florets just opening or already open (for best vase life). Cut in the morning with a sharp blade, leaving several sets of leaves and stems on the plant to encourage new blooms. Expect best results around ~60 days from sowing, with ongoing harvests whenever new heads reach full color.

Sunlight seems to pour straight through Zinnia’s petals—bold, saturated blooms with a velvety, layered look that holds its color with remarkable confidence. Expect sturdy stems and a generous flush of flowers in about 60 days, making it a standout for fresh bouquets and long-lasting arrangements. Drought-tolerant and sun-loving, Zinnia thrives where other annuals hesitate, rewarding gardeners with a vivid, garden-to-vase showpiece all season long.

Sowing Tips

Transplant Conditions

Wait until soil reaches 70°F and nights stay above 50°F before moving outdoors.

Expert Note

Direct-sow in warm soil after frost (or start only very shallowly indoors if you must), then thin for strong stems and maximum bloom duration.