Heirloom

Iron Pink

Matthiola incana

a bunch of pink hearts floating in the air

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", medium-light pink blooms with a full appearance. Flowers are a lighter shade than those of Iron Rose Pink. 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 Pink in USDA Zone 7

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Zone Map

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Iron Pink · Zones 6–10

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

SeasonWarm season annual

FlavorPeppery, clove-like flavor with aromatic complexity.

ColorMedium-light 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	—

Succession Planting

Stocks bolt and lose quality fast once daytime highs push past 75–80°F, so the spring succession window is tight. In zone 7, start a first round indoors in early February and transplant in late April, then start a second round indoors in late February for a May transplant. That gives you two overlapping flushes before summer shuts things down. A third round isn't worth the effort unless you have a genuinely cool microclimate — they'll stall before they bloom.

For a fall cut-flower run, direct sow or transplant in mid-August once nighttime temperatures drop back below 70°F, aiming for bloom by October. Fall stocks often outperform spring ones because the cool stretch is longer and more stable than the narrow gap between late frost and the first real heat of the season.

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

Seeds will ripen in August and September.

Harvest time: Fall

Storage & Preservation

Iron Pink flowers maintain best quality when kept in cool water immediately after harvest. Store fresh-cut stems in the refrigerator at 35-40°F with high humidity (85-95%) to extend vase life to 7-10 days. For preservation, hang-dry stems in a dark, well-ventilated space for dried arrangements lasting several months. Alternatively, press individual florets between parchment for 2-3 weeks to preserve for crafts or culinary garnishes. Freezing in ice cubes with water creates decorative elements for beverages and maintains color for up to 3 months.

History & Origin

Origin: The Coast of Europe from Spain to Greece.

Advantages

+Strong, rigid stems ideal for commercial cut flower production
+Highly uniform series ensures consistent one-cut harvest quality
+Performs reliably across spring, early summer, and fall seasons
+Compact 1.5-2 inch blooms with full appearance and medium-light pink color
+Edible flowers with peppery, clove-like flavor for culinary garnish

Considerations

-Slightly later to flower compared to Katz variety standard
-Single stem per plant with pinching terminating all flowering potential
-Somewhat shorter and thicker stems than competing Katz cultivar
-Produces lighter pink shade than Iron Rose Pink variety option

Companion Plants

Marigolds and sweet alyssum are the most useful neighbors for Iron Pink stocks. French marigolds (Tagetes patula) deter aphids and thrips through root exudates and scent — and aphids will find your stocks if given any opening. Sweet alyssum draws in parasitic wasps and hoverflies, the kind that dismantle aphid colonies, and it stays low enough not to shade the stocks out. Nasturtiums pull double duty as a trap crop, clustering aphids on their own foliage and off your flower stems. Lavender confuses soft-bodied pests with its volatile oils, and in our zone 7 Georgia garden it comes back every spring without replanting, so that benefit compounds over time.

Black walnut is the one neighbor to avoid entirely. Juglone — the allelopathic compound the roots release — will stunt or kill Matthiola, and the effect isn't always obvious until a plant simply refuses to thrive. Sunflowers cause a subtler version of the same problem: their own allelopathic compounds slow nearby annuals, and their canopy will outcompete stocks for the 6+ hours of direct sun this variety actually needs.

Plant Together

Marigolds

Repel nematodes and aphids while attracting beneficial insects

Sweet Alyssum

Attracts beneficial insects and provides ground cover to retain soil moisture

Nasturtiums

Act as trap crops for aphids and cucumber beetles while repelling squash bugs

Lavender

Repels moths, fleas, and mosquitoes while attracting pollinators

Cosmos

Attract beneficial insects and provide complementary colors without competing for nutrients

Zinnias

Attract butterflies and beneficial insects while requiring similar growing conditions

Petunias

Repel aphids, tomato hornworms, and squash bugs naturally

Catnip

Repels mosquitoes, ants, and rodents effectively

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive plants

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby plants

Sunflowers

Compete aggressively for nutrients and water while casting excessive shade

Troubleshooting Iron Pink

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

Gray fuzzy coating on stems or flower buds, plants collapsing at the base during cool, wet weather

Likely Causes

Botrytis cinerea (gray mold) — thrives in humid, still air, especially when plants are crowded or overwatered
Poor drainage holding moisture at the crown

What to Do

1.Remove and bag any affected stems immediately — don't compost them
2.Space plants at least 10–12 inches apart to open up airflow
3.Water at the base only, and do it in the morning so foliage dries before evening

Yellowing leaves and stunted growth, sometimes with a purple tint to the undersides, starting 3–4 weeks after transplant

Likely Causes

Downy mildew (Peronospora matthiolae) — a water mold specific to Matthiola, common in cool and humid springs
Phosphorus lockout in cold or waterlogged soil keeping roots from feeding

What to Do

1.Pull and discard heavily infected plants — this one spreads fast in a crowded bed
2.Let the soil warm to at least 55°F before transplanting; early transplants in cold ground are sitting ducks
3.Top-dress with a balanced granular fertilizer (something like 10-10-10) and scratch it in lightly to get phosphorus moving

Stems elongating fast, flowers thin and sparse, plants flopping over by mid-season

Likely Causes

Too little direct sun — stocks need 6+ hours and stretch hard in shade
Excessive nitrogen from a heavy compost application pushing vegetative growth at the expense of flowering

What to Do

1.Relocate seedlings (or plan next year's bed) to a spot with true full sun, not just 'bright'
2.Skip the heavy compost amendment for stocks; they don't need rich soil — a light side-dress of low-nitrogen fertilizer around week 6 is plenty
3.Stake individual stems with bamboo canes and soft twine if you need to salvage a floppy planting

Frequently Asked Questions

How long does Iron Pink flower last in a vase?▼

Iron Pink flowers typically last 7-10 days in a vase when kept in cool water and refrigerated at 35-40°F. Change water every 2-3 days and trim stems at an angle to maximize longevity. Their strong, rigid stems hold up well without support.

Can I grow Iron Pink stock flowers in containers?▼

Yes, Iron Pink grows well in containers given their single-stem, column-type habit. Use well-draining potting soil and containers at least 6-8 inches deep. Ensure full sun to partial shade (4-6+ hours) and consistent moisture. Container growing is convenient for one-cut harvest operations.

Is Iron Pink stock suitable for beginner growers?▼

Absolutely. Iron Pink is rated as Easy to grow and performs well in spring, early summer, and fall. The variety doesn't require pinching or complex care. Its uniform growth habit and early flowering make it ideal for novice gardeners and commercial growers alike.

What does Iron Pink stock flower taste like?▼

Iron Pink flowers have a peppery, clove-like flavor profile with aromatic complexity. This distinctive taste makes them excellent as edible garnishes on salads, desserts, and cocktails. The flowers add both visual appeal and subtle spice to culinary presentations.

When should I plant Iron Pink stock for best results?▼

Plant Iron Pink in spring, early summer, or fall for optimal performance based on variety trials. They reach harvest in 90-105 days. Start seeds indoors 6-8 weeks before your intended planting date, or direct sow after frost risk passes in your region.

How does Iron Pink compare to Iron Rose Pink?▼

Iron Pink produces lighter, medium-light pink blooms compared to the darker shade of Iron Rose Pink. Both are column-type stocks with strong stems, but Iron Pink's tightly spaced florets create a more compact flower spike (1.5-2 inches) with a fuller appearance.