Heirloom

Tetra White

Tanacetum parthenium

Fully double 3/4-1" blooms uniformly fill the top of the plant, making it a very productive cut flower. Blooms are pure white with citrus-yellow to lime-green centers. Tender or short-lived perennial in Zones 5-9. Also known as feverfew.

Harvest

100-110d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

5–8

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 Tetra White in USDA Zone 7

All Zone 7 flower →

Zone Map

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Tetra White · Zones 5–8

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing12-18 inches

WaterRegular, consistent moisture during growing season

SeasonTender Perennial

ColorPure white with citrus-yellow to lime-green centers

Size3/4-1"

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

Tetra White is a tender perennial that blooms over a long season once established — you're not harvesting a discrete crop and replanting on a schedule. A single sowing started indoors in February or March (zone 7) will flower from midsummer through fall and, in zones 7 and warmer, may overwinter and return the following year. Succession sowing doesn't apply here.

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: High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 3 ft. 0 in.. Spread: 1 ft. 0 in. - 2 ft. 0 in.. Spacing: Less than 12 inches, 12 inches-3 feet. Growth rate: Rapid. Maintenance: Low, Medium. Propagation: Division, Seed. Regions: Coastal, Piedmont.

Harvesting

The center disk of the flower becomes a head of dry, brown seeds. The seeds are ribbed and measure 1-2 mm long. The plant is self-seeding and can be aggressive.

Color: Brown/Copper. Length: < 1 inch. Width: < 1 inch.

Harvest time: Fall

Edibility: Edible leaves can make tea.

Storage & Preservation

Store fresh Tetra White blooms in a cool location, ideally in the refrigerator at 35-40°F with 90-95% humidity to maximize vase life of 7-10 days. Keep stems in fresh, clean water and re-cut stems every 2-3 days. For preservation, air-dry blooms by hanging upside-down in a dark, well-ventilated space for 2-3 weeks to retain color and structure. Alternatively, press flowers between parchment paper under heavy books for 1-2 weeks for dried arrangements. Freeze-drying preserves delicate petals for long-term storage and craft applications.

History & Origin

Origin: Southeastern Europe to Central Asia and West Himalaya

Advantages

+Attracts: Bees, Butterflies, Hummingbirds
+Edible: Edible leaves can make tea.
+Fast-growing
+Low maintenance

Considerations

-Toxic: Low severity
-Causes contact dermatitis

Companion Plants

Marigolds, Sweet Alyssum, and Nasturtiums are the companions worth planting near Tetra White. French marigolds (like 'Petite Harmony') push out aphids and whiteflies through both root exudates and scent — useful because feverfew's dense white canopy can shelter soft-bodied insects when airflow is poor. Sweet Alyssum, topping out at 3–6 inches, draws in parasitic wasps that go after aphids and thrips without shading out anything. Nasturtiums work differently: they pull aphids onto themselves, concentrating the problem in one spot where you can actually do something about it.

Black Walnut is the one to plant nowhere near Tetra White or most other herbaceous plants — its roots release juglone, and even moderate exposure stunts growth. Eucalyptus produces its own allelopathic compounds in leaf litter and root exudates that suppress nearby plants similarly. Fennel is a different category of bad neighbor: it doesn't produce one specific toxin so much as it chemically suppresses almost everything around it, and feverfew is no exception. Give fennel its own container or its own far corner of the yard.

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 adding color contrast

Lobelia

Complements white flowers with blue blooms and thrives in similar growing conditions

Petunias

Repel tomato hornworms and aphids while providing continuous blooms

Zinnias

Attract beneficial pollinators and predatory insects while adding height variation

Catnip

Repels mosquitoes, ants, and rodents through natural compounds

Cosmos

Attract beneficial insects and provide structural support in mixed plantings

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive flowering plants

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby plants

Fennel

Inhibits growth of most garden plants through allelopathic root secretions

Troubleshooting Tetra White

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

Leaves and stems covered in white powdery coating, usually showing up in midsummer when nights cool down

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — fungal, thrives when days are warm and nights are cool with low airflow
Crowded planting below the 12-inch spacing minimum

What to Do

1.Cut out the worst-affected stems at the base and dispose of them — don't compost
2.Thin plants to at least 12 inches apart to get air moving through the foliage
3.Apply a diluted neem oil spray (2 tsp per quart of water) every 7 days until new growth comes in clean

Seedlings falling over at the soil line within the first 2 weeks after germination

Likely Causes

Pythium or Rhizoctonia fungi in overly wet, poorly drained seed-starting mix
Starting seeds in trays without bottom drainage, or misting so heavily that the surface stays wet for hours

What to Do

1.Start fresh in a sterile seed-starting mix — don't reuse last year's tray soil
2.Water from the bottom by setting trays in a shallow pan; let the surface dry slightly between waterings
3.Run a small fan on low near your seedlings for 30 minutes a day to keep the surface from staying damp

Plant produces almost no flowers and keeps putting out leafy growth well into summer

Likely Causes

Too much nitrogen — either from a heavy compost application or a high-N fertilizer pushing vegetative growth at the expense of blooms
Insufficient sun — Tetra White needs at least 4–6 hours of direct light to flower reliably

What to Do

1.Hold off on any additional feeding; if you top-dressed with compost in spring, skip further amendments this season
2.Move container plants to a sunnier spot, or note the bed location and plant something shade-tolerant there next year
3.Deadhead spent and forming buds consistently — removing them signals the plant to redirect energy into new flower production

Frequently Asked Questions

How long do Tetra White flowers last in a vase?▼

Tetra White blooms typically last 7-10 days in a vase when stored in cool conditions (35-40°F) with fresh water and frequent stem re-cutting. They're excellent cut flowers due to their fully double blooms and productive flowering habit. Warmer room temperatures will shorten vase life, so keeping them in the refrigerator overnight extends their ornamental value.

Is Tetra White a good choice for beginners?▼

Yes, Tetra White is excellent for beginner gardeners. It's rated as 'Easy' difficulty and is a tender perennial (or short-lived perennial in Zones 5-9) that produces abundant blooms. The plant is low-maintenance, requires only basic care, and thrives in full sun to partial shade with minimal pest or disease pressure, making it perfect for those new to gardening.

Can you grow Tetra White in containers?▼

Yes, Tetra White grows well in containers. Its compact, productive habit makes it ideal for pots and hanging baskets, especially as a cut flower source. Use well-draining potting soil and ensure containers have drainage holes. Place containers in areas receiving 4-6+ hours of sunlight daily. Container growing allows easier management in cooler zones where it's treated as an annual.

When should I plant Tetra White seeds?▼

Plant Tetra White indoors 6-8 weeks before your last spring frost, or direct sow after the last frost date once soil warms. Germination typically occurs within 7-14 days at proper temperatures. In frost-free climates (Zones 9+), you can plant in fall for winter/early spring blooms, while in Zones 5-8 treat as a seasonal annual or short-lived perennial.

What are the yellow-green centers on Tetra White blooms?▼

The citrus-yellow to lime-green centers are a distinctive feature of Tetra White feverfew flowers. These contrasting centers add visual interest to the pure white, fully double petals, making them particularly attractive as cut flowers. The centers remain vibrant throughout the bloom's vase life and dry period.

How many hours of sunlight does Tetra White need?▼

Tetra White requires a minimum of 4-6+ hours of direct sunlight daily for optimal flowering and plant productivity. It tolerates partial shade but produces best results in full sun conditions. Insufficient light may reduce bloom quantity and quality, so placement in south-facing or east-facing garden beds is recommended for maximum flower production.