Green Twister

Echinacea

Zone 9b Save Garden

🌱 70d to harvest Upright

Green Twister blooms with an arresting, chartreuse twist—petals that curl and spiral around a tightly domed center, giving each f…

Crop Dates

Milestone	Date
Start Indoors	Dec 15th
Last Frost	Feb 9th
Transplant / Sow Outdoors	Apr 6th
Harvest Begins	Jun 15th
Harvest Ends	Dec 9th

Crop Details

Trait	Value
Days to Maturity	70
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	40
Harden Off (days)	7

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Frequently Asked Questions

What’s the most common pest or disease for Echinacea purpurea (purple coneflower) and how can I prevent or treat it?

Watch for powdery mildew, which shows up as a white coating on Echinacea leaves during warm, humid weather or if plants are crowded. Improve airflow by spacing plants (about 12–18 in / 30–45 cm) and water at the soil line rather than overhead; remove heavily affected leaves early. If it spreads, treat with a labeled fungicide for powdery mildew on ornamentals and repeat as directed at the first signs, not after leaves are fully coated.

How often should I water Echinacea purpurea during the main growing phase?

During active growth and flowering, keep soil evenly moist but not soggy—aim for watering when the top 1 in (2–3 cm) of soil feels dry. Typically this means about 1 in (2.5 cm) of water per week from rain and/or irrigation, with deeper watering rather than frequent light sprinkles. Once established, Echinacea tolerates some drought, but letting it repeatedly dry out can reduce flower size.

How do I tell when Echinacea purpurea is ready to harvest?

Harvest the seed heads (for drying) when the central cone is fully darkened and the tiny seeds are mature—often when most of the bracts around the cone look papery and dry. You can also cut flowers for bouquets when the petals are fully open and the central cone is firm, typically about 70 days from sowing under good conditions. For seed collection, wait until seeds are easily released from the cone and dry the heads indoors if they’re still slightly moist.

Green Twister blooms with an arresting, chartreuse twist—petals that curl and spiral around a tightly domed center, giving each flower a sculptural, lime-green glow. As the season advances, the texture turns from fresh, springy petals to a sturdier, seed-ready presence, making it as captivating in the garden as it is in bouquets. Grow Green Twister for long-lasting perennial color and a pollinator magnet that keeps the border lively from early summer into fall.

Sowing Tips

Transplant Conditions

Wait until soil reaches 40°F and nights stay above 40°F before moving outdoors. Harden off for 7 days first.

Expert Note

Cold-stratify seeds (moist, in the fridge 2–4 weeks) if germination is slow, then transplant after nights are reliably mild for the new seedlings to establish.