Comfrey Planting Guide

Comfrey is a vigorous perennial herb valued as a dynamic accumulator of nutrients. Its leaves make excellent mulch, compost activator, and liquid fertilizer.

Symphytum officinale · Herb · Boraginaceae family · 60–90 days to maturity

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Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.

Where Can You Grow Comfrey?

Zone Compatibility for Comfrey Zones 3a – 9b

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Ideal (data available) Suitable Marginal Not recommended

Planting Dates by Zone

Zone	Start Indoors	Direct Sow	Transplant	Harvest
Zone 3a	—	—	May 22	Jul 24 – Sep 25
Zone 3b	—	—	May 17	Jul 19 – Sep 20
Zone 4a	—	—	May 13	Jul 15 – Sep 23
Zone 4b	—	—	May 8	Jul 10 – Sep 18
Zone 5a	—	—	May 2	Jul 4 – Sep 12
Zone 5b	—	—	Apr 25	Jun 27 – Sep 5
Zone 6a	—	—	Apr 17	Jun 19 – Aug 28
Zone 6b	—	—	Apr 10	Jun 12 – Aug 21
Zone 7a	—	—	Apr 1	Jun 3 – Aug 12
Zone 7b	—	—	Mar 25	May 27 – Aug 5
Zone 8a	—	—	Mar 15	May 17 – Jul 26
Zone 8b	—	—	Mar 4	May 6 – Jul 15
Zone 9a	—	—	Feb 17	Apr 21 – Jun 30
Zone 9b	—	—	Feb 1	Apr 5 – Jun 14

Why are some columns showing "—"?

Start Indoors shows "—" because Comfrey is typically direct sown outdoors rather than started indoors. It germinates quickly and doesn't transplant well.

Direct Sow shows "—" because Comfrey benefits from being started indoors first, then transplanted after the last frost.

How to Plant Comfrey

0.5"

Planting Depth

Between Plants

12"

Between Rows

Growing Conditions

☀️ Sun

Partial Shade (3-6 hours)

💧 Water

Moderate — regular watering

Water when the top inch of soil feels dry. Consistent moisture produces the best results.

🧪 Soil pH

6 – 7

Prefers neutral to slightly acidic soil — ideal for most garden beds.

🗺️ Hardiness Zones

Zone 3a – 9b

📅 Days to Maturity

60–90 days

Quick-growing crop. Multiple plantings per season are possible.

👪 Plant Family

Boraginaceae

Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Boraginaceae family crops grew last year.

Succession Planting Comfrey

Comfrey matures in just 60–90 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 3 successive plantings by sowing every 6.9 weeks.

Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.

Companion Planting for Comfrey

✅ Good Companions

Fruit Trees Tomatoes Peppers

Check more combinations with our Companion Planting Checker →

Growing Tips for Comfrey

Plant root cuttings 2 inches deep. Choose Bocking 14 variety to prevent self-seeding. Cut leaves 3-4 times per season for mulch or compost. Avoid planting near pathways as it spreads.

Saving Comfrey Seeds

Recommended for Your Garden

🪴

Fabric Grow Bags $10-25

Breathable fabric pots that promote healthy root growth and prevent overwatering.

🏺

Self-Watering Planters $15-40

Built-in reservoir keeps herbs and greens consistently watered with less effort.

🌱

Seed Starting Trays $8-20

Start seeds indoors with reusable cell trays and humidity domes.

Level Up Your Garden

Seed Saving & Storage Guide

Learn when to harvest, how to dry, and how to store seeds from 200 plants. Never buy seeds again.

Learn More →

Comfrey by State

Frequently Asked Questions

How long does it take to grow Comfrey?

Comfrey (Symphytum officinale) takes 60 to 90 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.

What zones can Comfrey grow in?

Comfrey can be grown in USDA zones 3a through 9b. Use the planting calendar above to find the exact dates for your zone.

How much sun does Comfrey need?

Growing Comfrey requires Partial Shade (3-6 hours), Moderate — regular watering, and soil pH of 6 to 7.

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