Mirabilis

Family: Nyctaginaceae

Genus: Mirabilis

Species: jalapa

History

Mirabilis, or Four O'Clocks, bloom late in the day and exude a sweet perfume at dusk. Originally from South America, their colourful flowers were once used in textile dyes. They were introduced to Australian gardens for their ease of care and whimsical blooming habit.

Sowing Calendar

Best Months to Plant – Mirabilis
Climate ZoneJanFebMarAprMayJunJulAugSepOctNovDec
Cool/Mountain✓✓✓✓
Temperate✓✓✓✓
Arid✓✓✓✓✓✓✓
Subtropical✓✓✓✓✓✓✓
Tropical✓✓✓✓✓✓✓✓✓✓✓✓
Cool/Mountain – Mirabilis
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays✓✓✓✓
Plant out transplants✓✓✓✓
Direct sow✓✓✓✓
Temperate – Mirabilis
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays✓✓✓✓
Plant out transplants✓✓✓✓
Direct sow✓✓✓✓
Arid – Mirabilis
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays✓✓✓✓✓✓✓
Plant out transplants✓✓✓✓✓✓✓
Direct sow✓✓✓✓✓✓✓
Subtropical – Mirabilis
MethodJanFebMarAprMayJunJulAugSepOctNovDec
Start in trays✓✓✓✓✓✓✓
Plant out transplants✓✓✓✓✓✓✓
Direct sow✓✓✓✓✓✓✓
Tropical – Mirabilis
MethodJanFebMarAprMayJunJulAugSepOctNovDec
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

Medium

• Benefits from regular watering, especially during active growth or flowering
• Soil should remain moist but not soggy—allow topsoil to dry slightly between waterings
• Ideal for most vegetables, herbs, and flowering annuals
• More frequent watering may be needed during hot or windy weather
• A layer of mulch can reduce water loss and improve consistency

Fertilisation

Frost

Frost Tolerant

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

Maintenance and Harvesting

Mirabilis benefits from occasional pruning to shape the plant and deadheading to limit reseeding. Water moderately, and cut back heavily in late autumn to promote regrowth in spring.

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.

Crown / root rot (Wet)

Crown and root rots are caused by water‑loving fungi that attack stems at the soil line and roots below. Plants yellow, wilt, and eventually collapse because their roots can no longer supply water and nutrients—most common in heavy, waterlogged soils.

Prevention is key: improve drainage, raise beds, and water deeply but less often. Avoid injuring stems at the soil line and rotate away from affected beds. Solarising soil in summer can knock back pathogens. Chemical drenches have limited benefit in home gardens and are best used preventatively rather than curatively.

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.

Rust

Rust diseases produce raised orange‑brown pustules on leaves and stems. Spores disperse easily on wind and water, causing repeated reinfection and gradual weakening of plants.

Remove infected material and avoid wetting foliage. Grow resistant varieties where possible and rotate crops. Organic sulfur or copper sprays can protect new growth; systemic fungicides are a chemical fallback if rust persists.

Leaf miners

Leaf miners can affect plant health and yields in home gardens. Typical symptoms include slowed growth, discolouration, and reduced productivity, often triggered by weather, nutrition, or cultural conditions.

Start with cultural fixes: rotate crops, improve soil with compost, water consistently, and choose resistant varieties. Organic sprays or amendments can reduce severity; chemical options are a last resort and should be used carefully and in accordance with labels.

Growing Tips

• Mirabilis may grow leggy in shade; provide more sun and trim to keep compact.
• Mirabilis can struggle in heavy, waterlogged soils; improve drainage and avoid over-watering.
• Mirabilis performs best with steady moisture and regular harvesting to promote new growth.

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