When to Plant Echinacea (Coneflower) in Washington, District of Columbia (20006)

Location

Washington, District of Columbia

ZIP Code

20006

USDA Zone

Last Frost

Friday, March 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, January 9, 2026

Transplant Outdoors

Friday, April 3, 2026

Based on last frost Friday, March 20, 2026 · Zone 8a

Pro tip: Start Echinacea (Coneflower) seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, April 3, 2026.

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🌿 Plant Details

Scientific Name Echinacea purpurea

Days to Maturity 365 days

Mature Height 24-48"

Spread 24"

Type Perennial

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Low (drought tolerant once established)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Echinacea (Coneflower) in Washington?

Get your seeds now so they're ready by Friday, January 9, 2026.

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🤝 Good Companions

Black-eyed SusanLavenderSage

🤝

Full Companion Planting Guide for Echinacea (Coneflower)

See which plants help Echinacea (Coneflower) thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow seed heads to dry fully on the plant through fall. Leave for birds or harvest before winter.

Processing

Wear gloves — seed heads are spiky. Rub seeds out with gloved hands, spread to dry 1 week.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Cold-stratify seeds for 4–8 weeks to significantly improve germination rates.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Echinacea (Coneflower). See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Echinacea (Coneflower) in Washington, District of Columbia? +

In Washington (Zone 8a), start Echinacea (Coneflower) seeds indoors around Friday, January 9, 2026 and transplant outdoors around Friday, April 3, 2026.

What is the last frost date for Washington, District of Columbia? +

The average last spring frost date for Washington, District of Columbia (ZIP 20006) is around Friday, March 20, 2026. This is based on NOAA climate normals for USDA Zone 8a.

How long does Echinacea (Coneflower) take to grow? +

Echinacea (Coneflower) typically matures in about 365 days from transplanting. In Washington, that means you can expect harvest around Friday, April 3, 2026 plus 365 days.

Should I start Echinacea (Coneflower) indoors or direct sow in District of Columbia? +

Echinacea (Coneflower) should be started indoors 10 weeks before your last frost date. In Washington, that means starting around Friday, January 9, 2026.

📚 More Echinacea (Coneflower) Planting Guides

🗺️

Echinacea (Coneflower) in District of Columbia

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 8a Echinacea (Coneflower) Guide

All cities in your zone · Avg dates

→

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Growing Echinacea (Coneflower) in Zone 8a

Echinacea (Coneflower) (Echinacea purpurea) is a popular garden vegetable. In Washington, District of Columbia, which is in USDA Hardiness Zone 8a, you should start seeds indoors around Friday, January 9, 2026.

Your average last frost date is Friday, March 20, 2026. Plan to transplant your Echinacea (Coneflower) seedlings outdoors around Friday, April 3, 2026, about 2 weeks after your last frost date.