How to grow marigold in Australia
Marigolds are the classic vegetable-garden companion flower. The bright orange and yellow blooms attract pollinators, the root secretions are widely thought to deter nematodes in the soil (the evidence is genuine, particularly for French marigolds), and the strong scent may deter some insect pests. Beyond their utility, marigolds are simply easy and cheerful flowers — plant them once in a vegetable bed and they bloom continuously for months with no fuss.
When to plant
Marigolds are warm-season annuals, frost-sensitive but otherwise easy.
April to September in the dry season.
September to April.
September to March.
October to March. Wait until after frost.
November to February. Short window in cool climates.
September to April.
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Marigolds are easy from seed or seedlings. Seeds germinate readily in warm soil.
Spacing: 20–30cm between plants for French marigolds; 30–45cm for African marigolds.
Depth: Sow seeds 5mm deep.
Soil: Average garden soil. Don't fertilise heavily — too much nitrogen produces leaves at the expense of flowers.
Pots, raised beds, or in-ground?
Marigolds suit all three options.
In-ground is the standard, particularly when planted as companion flowers in vegetable beds.
Raised beds suit marigolds well as edging or border plants.
Pots are excellent for marigolds. A 20cm pot supports 2–3 plants for a productive container display. Use basic potting mix.
Sunlight & water
Full sun — 6 to 8 hours daily.
Water moderately. Marigolds tolerate some drought once established.
When and how to harvest
Marigolds aren't harvested in the traditional sense, but deadheading (removing spent flowers) encourages continuous blooming. Without deadheading, plants set seed and slow flowering.
The petals of some varieties are edible (use sparingly — flavour is mild and slightly bitter), and the flowers can be dried for craft use.
Collect seeds from spent flowers at the end of the season for next year's planting.
Common problems
Slugs and snails on young plants. Beer traps or iron-based bait.
Powdery mildew in humid conditions. Improve airflow.
Spider mites in hot dry conditions. Water spray helps.
Companion planting
Plant near: Tomato (most classic combination — may deter whitefly and nematodes), brassicas, capsicum, beans, eggplant, potato, roses.
Keep away from: Nothing significant — marigolds are good neighbours throughout the garden.
Australian varieties
French Marigold (Tagetes patula) — Smaller compact plants (20–30cm) with smaller flowers in red, orange, yellow, and mahogany. The variety most credited with nematode-deterrent properties. Most useful as companion plants in vegetable gardens.
African Marigold (Tagetes erecta) — Tall plants (60cm+) with large pompom-style flowers, usually orange or yellow. More decorative than functional in companion planting.
Signet Marigold (Tagetes tenuifolia) — Smaller, more delicate plants with edible flowers (the most palatable of the marigolds). Lemon Gem and Tangerine Gem are common varieties.
Single Mix / Naughty Marietta — French marigold variety with single (not double) flowers. Attracts bees better than double-flowered types.
Pet safety
Pet safety information is provided as a general guide only. If your pet has consumed any plant material, contact your vet or the Animal Poisons Helpline on 1300 869 738 immediately.