How to Grow Inodorum

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Inodorum

Tripleurospermum inodorum

flower

Inodorum, commonly known as scentless mayweed or false chamomile, is a delicate annual or winter annual wildflower in the Asteraceae family. It produces abundant small white daisy-like flowers with yellow centers and feathery, fine-textured foliage. Despite its common name suggesting chamomile, it lacks the aromatic properties of true chamomile.

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Example Inodorum timeline · Pittsburgh, PA (Zone 6b)

Plant Inodorum
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
First Inodorum blooms
Around Jun 1

≈ 45 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Inodorum dates for your own zip code.

Growing Conditions

☀️

Sun: Full sun, 6+ hours daily; tolerates partial shade but flowers more profusely in full sun

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Water: Moderate watering; prefers consistently moist but not waterlogged soil. Drought tolerant once established. Reduce watering in winter for cold-hardy strains.

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Spacing: 9 inches

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Days to maturity: 45-60 days from transplant to first flowers

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Planting depth: Surface sow or barely cover seeds; light is beneficial for germination

Soil

Type: Well-draining loamy or sandy soil

pH: 6.0-7.5

Amendments:

Compost for improved drainage Perlite or coarse sand in heavy clay soils Minimal fertilization needed

Growing Zones

Find your zone →

Thrives in zones 2-8; very cold hardy and adaptable

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b

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Growth Stages

Germination

7-14 days

Seeds sprout with fine cotyledons; seedlings are delicate and small

Keep soil evenly moist but not waterlogged. Provide bright indirect light. Germinates in 7-14 days at 65-70°F.

Seedling

2-3 weeks

Feathery true leaves emerge; plants develop their characteristic fine, lacy foliage

Thin seedlings to proper spacing. Maintain consistent moisture. Begin gentle air circulation to strengthen stems.

Vegetative Growth

3-4 weeks

Plants form bushy mounds of fine foliage, reaching 12-24 inches tall depending on variety

Water regularly during dry spells. Light fertilization with balanced fertilizer if needed. Pinch back for bushier growth.

Flowering

6-10 weeks

Small white daisy-like flowers with yellow centers appear abundantly across the plant

Deadhead spent flowers to encourage continuous blooming. Maintain consistent watering. Stake tall varieties if needed.

Seed Production & Decline

2-4 weeks until frost

Flowers mature into small seed heads; plants may self-seed prolifically

Allow some flowers to set seed for future generations. Remove spent plants if volunteer seedlings are not desired.

Companion Planting

Plan your garden →

Plant with:

Cosmos Zinnias Calendula Cornflowers Sweet alyssum Buckwheat Borage

Avoid planting near:

Allelopathic plants that may inhibit growth are minimal; avoid overcrowding with aggressive perennials

Common Pests

Spray with strong water jet or insecticidal soap. Encourage beneficial insects like ladybugs.
Increase humidity; spray with neem oil or miticide if severe. Remove heavily infested leaves.
Improve air circulation, avoid wetting foliage. Apply sulfur fungicide if severe.

Uses

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Cut flowers and arrangements

Household

Inodorum's delicate white flowers with feathery foliage make excellent filler flowers for bouquets, dried arrangements, and floral designs. The flowers last several days in water. [source]

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Pollinator attraction

Wildlife

Flowers attract bees, butterflies, hoverflies, and other beneficial insects, making it valuable in pollinator gardens and integrated pest management plantings. [source]

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Traditional herbal use

Medicinal

Historically used in folk medicine as a mild digestive and anti-inflammatory, though it lacks the potency of true chamomile. Modern use is primarily ornamental. [source]

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Edible flower garnish

Culinary

Petals can be used as a mild-flavored, delicate garnish for salads and desserts. Taste is subtle and slightly sweet, different from chamomile. [source]

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Dried flower arrangements

Craft

Excellent for dried arrangements and pressed flower crafts due to its delicate structure and long-lasting qualities when properly dried. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

For cut flowers, harvest in early morning when blooms are fully open but fresh. For seed collection, allow flowers to mature and dry on plant, then harvest seed heads and store in cool, dry location. Flowers are most abundant in spring and early summer; production may slow in heat.

Fun Facts

🌱 Despite its scientific name 'inodorum' meaning 'without scent,' inodorum does have a faint, subtle fragrance, unlike the stronger aroma of true chamomile (Matricaria chamomilla).
🌱 Inodorum is naturalized across North America and Europe, often appearing as a volunteer in disturbed soils and gardens, making it a somewhat aggressive self-seeder.
🌱 The plant is highly cold-hardy and can overwinter in harsh climates, with winter annuals sometimes flowering in late fall before freezing temperatures.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Annual Deadhead Full Sun Partial Shade Pinch Back True Leaves

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