Mirabilis jalapa: The Night Beauty Mallow That Flowers in 60 Days

Many amateur gardeners know the issue: empty patches in borders, bare areas beside a fence and containers on the patio that look rather dull. Traditional perennials often need more than one season to become established. This is where an old, nearly forgotten garden plant shows its greatest strength: it grows at speed, flowers well into the evening and turns any space into a colourful focal point in its first year.

The ‘beauty of the night’: what this plant is all about

This plant is the so-called night beauty mallow, botanically Mirabilis jalapa, and commonly known as the ‘wonder flower’ or ‘night flower’. Originally from South America, it produces underground tubers that resemble small, dark turnips. During summer, these develop into a bushy plant around 40 to 80 cm tall.

Its branching stems carry soft, heart-shaped leaves. The real display, however, starts in the late afternoon: its trumpet-shaped flowers open, release a sweet fragrance and close again with the first light of morning.

“From seed to fragrant evening flower in only around 60 days – there is hardly a faster way to fill gaps in a border.”

Its range of colours is especially appealing. Flowers may be white, yellow, pink, red, purple or bicoloured. A single plant can sometimes produce several shades at once, with marbled or speckled markings. Anyone who enjoys summer evenings on the balcony or patio can look forward to a different ‘evening programme’ each day.

Why the night flower quickly becomes a focal point

While many perennials take one or two years to properly get going, Mirabilis grows at a pace that surprises garden enthusiasts. In favourable conditions, the first blooms often appear just two months after sowing.

Seeds usually germinate within seven to ten days, provided they are not planted too deeply and receive enough warmth. The plants then gain height quickly, branch strongly and develop plentiful buds that continue to appear.

• Germination period: around 7–10 days
• Time to flowering: usually around 60 days
• Flowering period: from late spring until the first frosts
• Height: around 40–80 cm, depending on the position

These qualities make the night flower ideal for impatient gardeners, rented gardens used for only a limited time, or anyone planning a complete garden overhaul in spring.

Getting the timing right: when to start in spring

The starting date makes a real difference if the plant is to fulfil its potential. There are two main options: raising plants indoors or sowing directly into the border.

Raising plants on a windowsill or in a greenhouse

For flowers as early as possible, sow indoors six to eight weeks before the last expected frost. This head start is particularly worthwhile in cooler areas.

• Fill small pots or seed trays with loose, low-nutrient compost
• Plant each seed roughly 1.5 cm deep
• Moisten the compost without soaking it
• Keep temperatures at around 18–20 °C
• Maintain even moisture until germination

One practical tip: the seeds have a fairly hard outer coating. Soaking them in lukewarm water overnight softens this layer and encourages more even germination.

Sowing directly outdoors

Patient gardeners can sow directly into the border instead. Wait until the soil has properly warmed up and there is no longer a risk of severe night frosts. In many areas, this is from around mid-May.

Here too, sow the seeds about 1.5 cm deep. Allow 25 to 40 cm between plants, depending on the variety, so their bushy growth has sufficient room to develop without restriction.

Position and soil: where the night flower grows best

This plant thrives in sunshine. For abundant flowering, give it at least six hours of direct light each day. It will also grow in light partial shade, but will produce noticeably fewer flowers and usually develop a more open habit.

It is fairly undemanding about soil, although it responds well to fresh, humus-rich ground. Waterlogging is unsuitable. On heavy soils, adding sand or fine gravel improves drainage. During dry spells, around 2.5 cm of rainfall or watering per week is sufficient in the garden; a little more may be required during hot weather.

“Plenty of sun, well-drained soil and moderate watering: this night flower asks for little more – and rewards it with months of blooms.”

Growing in pots or containers

Balcony gardeners can also make the most of this plant. Choose a sufficiently deep container, as the tubers grow downwards. A depth of 30 to 40 cm is a useful guide.

• Select a pot with drainage holes
• Add a drainage layer of expanded clay or gravel
• Use a mixture of garden soil and multi-purpose compost
• Water regularly but not excessively during summer

In containers, sunshine warms the compost more quickly, which speeds up development. At the same time, the growing medium dries out faster, so it is worth monitoring moisture levels closely.

Care, overwintering and controlling its spread

In day-to-day cultivation, Mirabilis proves remarkably resilient. It copes with hot periods much better than many classic summer bedding plants. Serious problems with diseases or pests are also uncommon.

Lightly removing faded flowers encourages continued blooming. If time is limited, at least remove seed heads near paths and seating areas to restrict uncontrolled self-seeding. In suitable locations, the plant does tend to reproduce by itself.

Care task	Frequency	Benefit
Watering	Depending on the weather, 1–2 times a week	Prevents drought stress and keeps flowering going
Feeding	1–2 times per season	Encourages strong growth and plenty of buds
Removing spent flowers	Regularly, where possible	Limits self-seeding and produces more new blooms
Overwintering the tubers	Once in autumn	Preserves plants in cold regions

In mild areas, the tuberous roots can remain in the ground and will shoot again the following year. Over time, the plant then becomes a dependable perennial. In places with harsh winters, use the same approach as for dahlias: lift the tubers in autumn, remove the soil, store them dry and frost-free, then replant them in spring.

What families and pet owners should consider

As attractive as its flowers may be, the plant is considered poisonous, particularly its tubers and seeds. Anyone with young children or animals should consider its position carefully. Suitable locations include areas where children do not regularly play, or raised containers that are harder for dogs and cats to reach.

“The night flower is an ornamental plant, not a snack: tubers and seeds do not belong in children’s hands – or in a pet bowl.”

A short warning sign in the garden or a conversation with children can help prevent misunderstandings. In purely ornamental parts of the garden, however, the plant presents no issue at all.

Where this night flower works best in the garden

Careful placement makes the most of its rapid growth and evening flowering. It is particularly effective near seating areas, paths or patios that are mainly used in the late afternoon or evening.

• As a background plant in mixed borders
• In a container beside a balcony or patio door
• Combined with day-flowering plants such as pot marigolds or cosmos
• Between slow-growing perennials to bridge the waiting period

It becomes especially interesting when paired with plants that make their impact chiefly during the day, such as coneflowers or lavender. These take care of the colour display in daylight, while the night flower comes into its own in the evening with fragrance and fresh shades.

Those who enjoy experimenting can create an ‘evening border’: grow only species that truly come alive at dusk, such as night phlox or evening primrose alongside Mirabilis. The result is a garden that does not go to sleep with the sun, but instead becomes truly interesting as darkness falls.