Heirloom

Iron Cherry

Matthiola incana

Early single-stem, or column-type stock in a highly uniform series for one-cut harvest. Aptly named for strong, straight, rigid stems. Iron performed well in our spring, early summer, and fall trials. Selectable for doubles and 55% double without selection. Compared to Katz, Iron is slightly later to flower, and has somewhat shorter and thicker stems. Tightly spaced florets on the flower spike make for compact 1 1/2-2", soft blush/rose pink blooms with a full appearance. NOTE: This variety produces one flowering stem per plant. Pinching is not advisable as it will terminate flowering. Edible Flowers: The peppery, clove-like flavor of the flowers lends itself well to use as a garnish on salads, desserts, and drinks.

Harvest

90-105d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

6–10

USDA hardiness

🗺️

Height

1-3 feet

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Start Indoors

Transplant

Direct Sow

Showing dates for Iron Cherry in USDA Zone 7

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Zone Map

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Iron Cherry · Zones 6–10

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

SeasonWarm season annual

FlavorPeppery, clove-like flavor with a delicate spice profile.

Colorsoft blush pink

Size1 1/2-2"

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	April – May	June – July	June – August	—
Zone 4	March – April	June – June	June – July	—
Zone 5	March – April	May – June	May – July	—
Zone 6	March – April	May – June	May – July	—
Zone 7	February – March	April – May	April – June	—
Zone 8	February – March	April – May	April – June	—
Zone 9	January – February	March – April	March – May	—
Zone 10	January – January	February – March	February – April	—
Zone 1	May – June	July – August	July – September	—
Zone 2	April – May	June – July	June – August	—
Zone 11	January – January	January – February	January – March	—
Zone 12	January – January	January – February	January – March	—
Zone 13	January – January	January – February	January – March	—

Complete Growing Guide

Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 3 ft. 0 in.. Spread: 0 ft. 9 in. - 1 ft. 6 in.. Spacing: Less than 12 inches, 12 inches-3 feet. Growth rate: Rapid. Maintenance: Low. Propagation: Seed. Regions: Coastal, Mountains.

Harvesting

Iron Cherry reaches harvest at 90 - 105 days from sowing per Johnny's Selected Seeds. Expect 1 1/2-2" at peak. As an annual, harvest continues until frost ends the season.

Seeds will ripen in August and September.

Harvest time: Fall

Storage & Preservation

For fresh storage, keep Iron Cherry stems in a cool location (50-55°F) away from direct sunlight with water changed every 2-3 days. Shelf life ranges from 10-14 days in cool conditions. For preservation: (1) Air-dry by hanging stems upside-down in a warm, dark space for 2-3 weeks to create long-lasting dried arrangements; (2) Press individual florets between parchment paper under heavy weight for 1-2 weeks to preserve for crafts or culinary garnish; (3) Freeze flowers in ice cubes with water for decorative use in beverages, lasting several months when stored at 0°F.

History & Origin

Iron Cherry is open-pollinated, meaning seed saved from healthy plants will produce true-to-type offspring. Listed in the Johnny's Selected Seeds catalog.

Origin: The Coast of Europe from Spain to Greece.

Advantages

+Produces one strong, rigid stem ideal for single-stem cut flower harvesting
+Tightly spaced florets create full, compact blooms with excellent visual appeal
+Performs reliably across spring, early summer, and fall growing seasons
+Edible flowers offer unique peppery, clove-like flavor for culinary garnishing
+High uniformity in series allows predictable 55% doubles without active selection

Considerations

-Single stem per plant means no branching or secondary flowers possible
-Slightly later flowering compared to Katz variety requires longer production timeline
-Pinching terminates flowering making plant management options very limited

Companion Plants

Marigolds and nasturtiums belong near stock because aphids — which hit Matthiola hard — use scent to locate hosts, and both plants produce volatile compounds that scramble that signal. Chives and garlic work similarly and carry the added benefit of suppressing soil-borne fungal pressure, which matters for a brassica-family plant already prone to Pythium root rot. Lavender and catmint draw in hoverflies and parasitic wasps that do genuine pest control work at no cost to you. Black walnut is the one plant to site well away from: juglone leaches from roots across a wide radius and will stunt or kill stock outright — don't plant within the drip line, and often farther.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Lavender

Deters pests with strong fragrance and attracts pollinators

Chives

Repel aphids and Japanese beetles while improving soil health

Nasturtiums

Act as trap crops for aphids and cucumber beetles

Garlic

Natural fungicide properties and deters various pests

Comfrey

Deep roots bring nutrients to surface, acts as dynamic accumulator

Yarrow

Improves soil fertility and attracts beneficial predatory insects

Catmint

Repels ants, aphids, and rodents while attracting pollinators

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth of cherry trees

Wild Cherry

Can harbor shared diseases like black knot and brown rot

Grass

Competes for nutrients and water, especially problematic for young plants

Troubleshooting Iron Cherry

What you'll see, why it happens, and what to do about it.

Seedlings damping off at the soil line — stems pinch thin and topple within the first 2 weeks

Likely Causes

Pythium or Rhizoctonia fungi thriving in soggy, poorly-drained germination mix
Sowing too densely so moisture never clears between stems

What to Do

1.Water only from below and let the top 1/4 inch of mix dry out between waterings
2.Thin seedlings to at least 1 inch apart as soon as the first true leaf appears
3.If you're reusing trays, sanitize them with a 10% bleach solution before the next sowing

Leaves developing gray, powdery coating — usually on upper leaf surfaces first, mid-season

Likely Causes

Powdery mildew (Erysiphe cruciferarum) — common on brassica-family plants including stock in humid summers
Poor airflow from crowded spacing or nearby dense plantings

What to Do

1.Space plants at least 12 inches apart to let air move through
2.Apply a diluted potassium bicarbonate spray (1 tablespoon per gallon) at first sign — it won't cure existing growth but slows spread
3.Pull and trash heavily infected plants; don't compost them

Buds forming but failing to open, or flowers dropping before fully developed in hot weather

Likely Causes

Heat stress — Iron Cherry stock is a cool-season finisher; sustained daytime temps above 80°F shut down bloom development
Planting out too late in spring, missing the optimal flowering window before summer heat arrives

What to Do

1.Start seeds indoors 8–10 weeks before your last frost so plants are budding before daytime highs climb past 75°F
2.In zone 7, that means an indoor sow in February — plants started in April will likely run into heat before they ever peak
3.If you're in a hotter zone, try a fall planting: direct sow in September and let plants overwinter for spring bloom

Frequently Asked Questions

How long does it take for Iron Cherry stock to flower from seed?▼

Iron Cherry takes 90-105 days from planting to harvest-ready flowering stems. In spring and fall conditions, it flowers reliably within this window. For earlier blooms, start indoors 6-8 weeks before your last frost date. This variety produces a single flowering stem per plant, making timing predictable for succession planting.

Is Iron Cherry stock a good choice for beginner gardeners?▼

Yes, Iron Cherry is excellent for beginners. It's rated as an easy-to-grow variety with strong, rigid stems that rarely require staking. The variety produces uniform, attractive blooms without needing pinching or pruning. Its reliable performance in spring, summer, and fall makes it forgiving for new growers experimenting with timing and conditions.

Can you grow Iron Cherry in containers?▼

Yes, Iron Cherry can be grown in containers with proper spacing. Use a container at least 6 inches deep with well-draining potting soil. Provide full sun to partial shade (4-6+ hours) and keep soil consistently moist. Container growing works well for controlling plant density and succession planting for continuous blooms.

What does Iron Cherry flower taste like and how do you use it in cooking?▼

Iron Cherry flowers have a distinctive peppery, clove-like flavor. They're ideal as edible garnishes on salads, desserts, and beverages. The soft blush-pink blooms add both visual elegance and subtle spice. Avoid heavy-handed use—a few florets provide optimal flavor without overpowering dishes.

When should I plant Iron Cherry stock for summer blooms?▼

For summer blooms, start seeds indoors 6-8 weeks before your last spring frost, then transplant seedlings outdoors after frost danger passes. Alternatively, direct sow after last frost for slightly later blooms. Iron Cherry also performs well in early summer and fall sowings, giving you multiple harvest windows throughout the growing season.

Why shouldn't you pinch Iron Cherry stock plants?▼

Iron Cherry produces a single strong flowering stem per plant—its defining characteristic. Pinching removes the growing tip and terminates flowering entirely, meaning no blooms will develop. Unlike branching varieties, this single-stem design provides the uniform, straight-stem flowers ideal for one-cut harvest, so pinching must be avoided completely.