Marigold

History

Marigolds, native to Central America, have been used in rituals, cooking, and gardens since ancient times. The name comes from 'Mary's gold,' a nod to their religious symbolism. In Australia, they're loved for pest-repelling properties and bright blooms that stand out in both veggie patches and floral borders.

Sowing Calendar

GeneralCool/MountainTemperateAridSubtropicalTropical

Best Months to Plant – Marigold

Climate Zone	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cool/Mountain									✓	✓	✓	✓
Temperate									✓	✓	✓	✓
Arid							✓	✓	✓
Subtropical							✓	✓	✓
Tropical	✓	✓					✓	✓	✓	✓	✓	✓

Cool/Mountain – Marigold

Method	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Start in trays									✓	✓	✓	✓
Plant out transplants									✓	✓	✓	✓
Direct sow									✓	✓	✓	✓

Temperate – Marigold

Method	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Start in trays									✓	✓	✓	✓
Plant out transplants									✓	✓	✓	✓
Direct sow									✓	✓	✓	✓

Arid – Marigold

Method	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Start in trays							✓	✓	✓
Plant out transplants							✓	✓	✓
Direct sow							✓	✓	✓

Subtropical – Marigold

Method	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Start in trays							✓	✓	✓
Plant out transplants							✓	✓	✓
Direct sow							✓	✓	✓

Tropical – Marigold

Method	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Start in trays	✓	✓					✓	✓	✓	✓	✓	✓
Plant out transplants	✓	✓					✓	✓	✓	✓	✓	✓
Direct sow	✓	✓					✓	✓	✓	✓	✓	✓

Where to Plant

Shady Spots & Herb Gardens

Shady Spots & Herb Gardens
• Areas receiving dappled or indirect sunlight, often near trees or buildings
• Best for shade-tolerant herbs like mint, parsley, or greens like spinach
• Helps prevent sun stress and conserves moisture
• Often used in cooler corners of the garden

Containers & Pots

Containers & Pots
• Portable planting vessels suited for patios, balconies, and small areas
• Provide complete control over soil composition and drainage
• Great for herbs, greens, compact vegetables, or ornamental plants
• Allow plants to be moved to follow sun, shade, or seasonal conditions

Edges

Edges
• Narrow growing spaces along borders, fences, or pathways
• Perfect for low-growing or decorative plants like alyssum or herbs
• Helps soften garden boundaries and attract beneficial insects
• Makes efficient use of underutilised garden space

Borders & Companion Rows

Borders & Companion Rows
• Found along the edges of garden beds, paths, or between main crops
• Ideal for herbs, flowers, or pest-repelling plants that support the main crop
• Helps attract pollinators and beneficial insects
• Makes good use of smaller spaces and improves overall garden health

Pre-treatment

None Identified

There are no pre treatments required for germination.

Sowing Method

Start in Trays

• Fill seed trays or punnets with quality seed-raising mix
• Sow seeds at the correct depth—refer to seed packet for guidance
• Place trays in a warm, sheltered location with good light
• Mist or bottom-water to avoid disturbing small seeds
• Transplant seedlings once they develop 2–4 true leaves

Direct Sow

• Sow seeds directly into prepared garden soil or outdoor containers
• Best for plants that dislike transplanting, such as root vegetables and beans
• Loosen soil and remove weeds before sowing
• Sow at the recommended depth and spacing, then water gently
• Keep the area moist until germination and thin seedlings if needed

Watering

Low

• Suitable for drought-tolerant or Mediterranean-style plants
• Needs watering only during extended dry periods or heatwaves
• Prefers deep but infrequent watering to encourage strong root growth
• Ideal for well-drained soils and low-maintenance garden beds
• Mulching helps retain moisture and reduce watering even further

Fertilisation

Frost

Frost Tolerant

These plants can tolerate light to moderate frosts and may survive through cooler seasons.

Maintenance and Harvesting

Marigolds benefit from deadheading to prolong flowering. Remove yellowing leaves and spent blooms. They prefer full sun and moderate water, and thrive with occasional feeding.

Pests and Diseases

Aphids

Aphids are tiny, soft-bodied insects that cluster on new growth and the undersides of leaves. They suck sap from plants, causing leaves to curl, yellow or become distorted. As they feed, they excrete sticky honeydew that encourages sooty mould, and colonies can build quickly in warm weather.

Start with organic controls: blast colonies off with a firm jet of water, encourage beneficial insects like ladybirds and lacewings, and spray neem oil or insecticidal soap to disrupt feeding. Keep plants well watered and avoid excess nitrogen that promotes soft growth. If pressure remains high, selective chemical sprays can be used sparingly, taking care to protect pollinators and beneficials.

Leaf spot

Leaf spot describes several fungal or bacterial diseases that create dark, often round lesions on foliage—sometimes with yellow halos. Severe infections cause premature leaf drop and reduced vigour, especially during warm, wet spells or when leaves stay damp.

Reduce spread by removing infected leaves, watering at the base, and spacing plants for airflow. Mulch to limit soil splash and rotate crops. Organic preventatives include copper and sulfur sprays applied early. If disease escalates, registered fungicides offer a chemical backup.

Powdery mildew

Powdery mildew appears as a white, talc‑like coating on leaves and stems. It thrives in warm days, cool nights, and still air, and can weaken plants by reducing photosynthesis, leading to yellowing and early leaf drop.

Prune for airflow, avoid overhead watering, and remove badly affected foliage. Organic sprays such as milk solution, potassium bicarbonate, sulfur, or neem help suppress outbreaks. Chemical fungicides are effective when started early, but use sparingly to preserve beneficial organisms.

Two-spotted spider mites

Two‑spotted spider mites are tiny sap‑suckers that stipple leaves, causing a speckled, yellow look and fine webbing—worst in hot, dry conditions. Unchecked, plants can defoliate.

Increase humidity around plants, hose undersides of leaves, and release or encourage predatory mites. Neem and horticultural oils suppress populations organically. Miticides exist for heavy outbreaks; rotate actives to reduce resistance.

Thrips

Thrips are slender insects that rasp and suck plant tissues, leaving silvery streaks and distorted growth on leaves and flowers. They can also transmit plant viruses.

Use blue or yellow sticky traps to monitor and reduce numbers, weed around beds, and encourage beneficials like minute pirate bugs. Neem oil and insecticidal soap offer organic suppression. If needed, use registered insecticides and rotate modes of action to avoid resistance.

Growing Tips

• Marigold stretches in shade; grow in full sun for compact plants.
• Marigold flowering pauses in extreme heat; keep watered and deadhead to resume.
• Marigold petals spot after heavy rain; provide airflow and morning sun.