Mirabilis jalapa

Growing in Pots, Balconies & Indoors

Four o’clock (Mirabilis jalapa) is a bushy, sun-loving flowering plant. The grower does not grow it as a houseplant, but it does very well in a large container on a sunny patio or balcony, and its tuber can be overwintered where winters are cold.

Quick Details

• Container Size: A large, sturdy container – it makes a substantial bush
• Indoor Suitability: Not a houseplant – needs full sun
• Best Spot: Full sun to half shade
• Soil & Drainage: Aerated, organic-rich, free-draining potting mix
• Watering in Pots: Water regularly in growth; it is fairly forgiving once established

Indoors & On the Windowsill

• Not a houseplant: The grower does not recommend it indoors – it needs full sun to bloom and turns leggy in low indoor light.
• Overwintering: It grows from a tuber; in cold climates you can bring the pot into a frost-free place to rest over winter, or lift and store the tuber, then restart it in spring.
• Keep away from pets & children: The seeds and roots are toxic if eaten – site it out of reach.

On a Balcony or Patio

• Light & wind: Give it the sunniest spot. Walls, railings and paving reflect heat, so pots dry fast – check moisture daily in warm weather, and shelter or stake tall growth from wind.
• Weight & runoff: A full pot of moist soil is heavy – check the balcony can take it, and stand pots so drainage water runs off cleanly without staining or flooding a neighbour below.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A pot with strong drainage holes and no standing-water saucer, so the roots never sit wet and rot. Terracotta breathes and dries faster (good against overwatering), while glazed or plastic holds moisture longer – match it to how often you water.
• Potting mix: A light, aerated, organic-rich mix – potting soil or peat/coir with perlite or vermiculite, blended with compost or well-rotted organic matter.
• Feeding: Nutrients leach out of pots with every watering, so potted plants need feeding more often than those in the ground – a balanced liquid feed through the growing season keeps them going.
• Repotting: Refresh the mix and pot up about every two years; for perennials, lightly trim the root ball and top growth at the same time to keep them vigorous.

Bloom & Flower Guide

Quick Details

• Bloom Season: Spring, summer and autumn
• Time to First Bloom: In its first year from seed
• Flower Appearance: Fragrant, trumpet-shaped flowers in purple, white, yellow, orange, pink or a mix, often with more than one colour on the same plant
• Edibility: Not edible – the plant is toxic, with the seeds and roots being the most poisonous parts

Detailed Blooming Overview

Mirabilis jalapa is aptly nicknamed the four o’clock flower: its fragrant, trumpet-shaped blooms open in the late afternoon and stay open through the evening and night, releasing a sweet scent, then fade by morning. A single plant often carries several colours at once – purple, white, yellow, orange and pink – sometimes streaked or flecked, over a long season from spring into autumn.

Flower Characteristics

• Trumpet-shaped, fragrant flowers in purple, white, yellow, orange, pink or mixed patterns.
• Often more than one colour on the same plant, sometimes streaked or speckled.
• Open in the late afternoon and evening rather than during the heat of the day.

Bloom Care & Thinning

• Managing the bloom: Very little is needed – plants flower freely; trimming keeps them shapely, and they self-seed readily if the seed is left to drop.
• Pollination: The evening scent draws long-tongued moths, including hawk moths, which are the main pollinators.
• Safety: All parts are toxic if eaten, especially the black seeds and the roots – keep them away from children and pets.