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When to plant Comfrey in Cypress, FL

Cypress's 258-day season only supports one Comfrey planting per year. Sow between March 13 and March 27 for the best chance at full maturity before November 19.

When to Plant Comfrey in Cypress, FL

Jackson County, Florida Zone 9a June

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Avg. last frost March 6
Avg. first frost November 19
Soil temp (4") 84°F
Watering Low
Pest pressure High
Daylight 14 hrs
  1. Basket week: comfrey

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

Cypress, Florida is in USDA Zone 9a. The average last spring frost is March 6 and the first fall frost is November 19, giving you a growing season of approximately 258 days.

At an elevation of 223 feet, Jackson County receives approximately 48.5 inches of rainfall annually with predominantly sand soil. Summer highs average 92°F, providing good warmth for Comfrey during the growing season. Sandy soil warms quickly in spring — great for early planting — but Comfrey will need more frequent watering and organic matter to retain nutrients.

Cypress, FL (Zone 9a) Long season
258 days
Last Spring Frost March 6
258 growing days
First Fall Frost November 19

Cypress Soil Profile

Soil Type

Sand

Soil pH

5.1-6

Drainage

Well Drained

Comfrey Planting Risk Windows

Early Start (70% safe) ✓ Fits season (117 days to spare)
Transplant: Mar 7 🍅 Harvest: May 9 – Jul 18
Recommended (50%) ✓ Fits season (118 days to spare)
Transplant: Mar 13 🍅 Harvest: May 15 – Jul 24
Safe Start (90%) ✓ Fits season (123 days to spare)
Transplant: Apr 3 🍅 Harvest: Jun 5 – Aug 14

Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.

Soil Compatibility in Cypress

How your county's soil matches Comfrey's growing requirements.

Soil pH

Your soil pH (5.1–6.0) is more acidic than Comfrey prefers (6.0–7.0). Add garden lime to raise pH.

Soil Texture

Sandy soil in Jackson County warms quickly in spring but drains fast. Comfrey will need more frequent watering and regular compost additions to retain nutrients.

Drainage

Drainage is adequate for Comfrey.

Organic Matter

Organic matter is low (1.3%). Add 2-3 inches of compost before planting Comfrey.

How to Plant Comfrey

0.5"
Planting Depth
8"
Between Plants
12"
Between Rows

Succession Planting Comfrey

5
successive plantings in your 258-day season

Sow every 6.9 weeks. Last sowing by Aug 21 to harvest before frost.

Comfrey Water Budget

Plant needs
1.0″/week
Rainfall provides
0.8″/week
You supply
0.6″/week
Watering frequency 1-2 times/week
Season total 1,407 gal / 100 sq ft
Drought risk

Water stress score is 6/10 — consider drought-tolerant varieties and mulching

Monthly Watering Guide for Comfrey

Comfrey needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.

Month Comfrey Needs Rainfall You Supplement Action
Jan 2.3" 0" ❄️ Dormant
Feb 2.6" 0" ❄️ Dormant
Mar 4.3" 2.7" 1.6" 💧 Light watering
Apr 4.3" 1.9" 2.4" 🚿 Regular watering
May 4.3" 3.2" 1.1" 💧 Light watering
Jun 4.3" 7" 0" ✅ Rainfall sufficient
Jul 4.3" 7.2" 0" ✅ Rainfall sufficient
Aug 4.3" 7.5" 0" ✅ Rainfall sufficient
Sep 4.3" 6.1" 0" ✅ Rainfall sufficient
Oct 4.3" 4" 0.3" 💧 Light watering
Nov 4.3" 1.9" 2.4" 🚿 Regular watering
Dec 2.1" 0" ❄️ Dormant

Water needs are for active growing months only (Mar–Nov in Jackson County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.

Comfrey Heat Requirements (GDD)

What are Growing Degree Days (GDD)?

Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.

Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.

Comfrey needs ~1,425 GDD — county provides 4,902 GDD Excellent fit

Comfrey Planting Timeline — Cypress, FL

Comfrey Planting Calendar

Activity When Date Range
Transplant Outdoors March 13 Mar 13 – Mar 27
Harvest May 15 May 15 – Jul 24

Plant 0.5" deep · 8" apart · Rows 12" apart

Month-by-Month Timeline

MonthActivities
January
February
March Transplant Outdoors
April
May Harvest
June Harvest
July Harvest
August
September
October
November
December

Growing Conditions

☀️ Sun

Partial Shade (3-6 hours)

💧 Water

1"/week · 1-2 times/week

📅 Days to Maturity

60–90 days

🧪 Soil pH

Needs 6–7 · Your soil: too_acidic

🗺️ USDA Zone

Zone 9a

📆 Growing Season

258 days in Jackson County

Growing Tips for Comfrey in Cypress

Direct sow Comfrey outdoors after March 06 in Jackson County when soil has warmed and frost danger has passed.

Sandy soil in Jackson County dries quickly — mulch Comfrey with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.

General growing tips

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.

Companion Planting

Good Companions

Check more plant combinations with our Companion Planting Checker →

When should I plant Comfrey in Cypress, FL?

In Cypress, FL, plant Comfrey after the last frost (around March 6) and before the first frost (around November 19). Best results when soil holds above 50°F.

What growing zone is Cypress, FL for Comfrey?

Cypress sits in USDA Zone 9a. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.

Can Comfrey grow in Cypress's climate?

Yes — Comfrey grows well in Cypress's temperate climate. Cypress averages a 258-day frost-free season, with last frost around March 6 and first frost around November 19.

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A 22-page printable planner built for Jackson County (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.

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Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates are based on 50% probability averages for Jackson County, FL. Local conditions may vary. Last updated: June 2026.