Vinca
Catharanthus roseus
Full sunSalt: 2 of 5
Adapted
FlowerExotic
Portulaca
Portulaca grandiflora
A jewel-bright, succulent-leaved annual that thrives in Dubai's hottest months on almost no water — part of the municipality's May–June summer bedding rotation.
Mature size0.1–0.2 m tall, 0.2–0.3 m spreadGrowthFastSunFull sunWaterVery low
Heat: 5 of 5
Salt: 2 of 5
Drought: 5 of 5
Shade: 1 of 5
Ease of care: 5 of 5
Season
Through the Dubai year
How Portulaca behaves through Dubai's seasons, month by month.
JJan
FFeb
MMar
AApr
MMay
JJun
JJul
AAug
SSep
OOct
NNov
DDec
Avg high °C
24°
26°
29°
34°
38°
40°
42°
42°
40°
36°
31°
27°
Can be direct-sown from seed
Can be direct-sown from seed
Planted out for summer bedding
Planted out for summer bedding
Continuous flowering through peak summer heat
Continuous flowering through peak summer heat
Can be direct-sown from seed: Mar–Apr
For an earlier start; most UAE gardens use nursery seedlings for the May–June rotation instead.
Planted out for summer bedding: May–Jun
Dubai Municipality's summer bedding rotation, alongside vinca.
Continuous flowering through peak summer heat: May–Sep
Individual flowers open in the morning sun and close by afternoon or on overcast days.
Portulaca is a summer specialist in Dubai, most often started from nursery seedlings in May and June as part of the city's heat-season bedding rotation. From planting through to around September it stays in more or less continuous flower, its cup-shaped blooms opening fresh each sunny morning and folding shut by afternoon or on an overcast day. It is rarely grown through a Dubai winter outdoors, since the cool-season bedding rotation of petunia and marigold takes over the same ground once temperatures ease, so its season here is really one long, uninterrupted summer run rather than a changing yearly cycle.
Meet the plant
Meet the Portulaca
Meet portulaca, the flower that treats Dubai's worst month as its best one. While most bedding plants are being lifted and composted ahead of June, moss rose is only just getting started, its fleshy, water-storing leaves letting it shrug off heat that would wilt almost anything else in a nursery tray. Cup-shaped single or double flowers in hot pink, red, orange, yellow and white open low along red-tinged stems, turning a bare, sun-blasted gap into a low carpet of colour within weeks.
It keeps its own schedule regardless of what a gardener wants from it: the flowers open in full morning sun and close by mid to late afternoon, and stay shut on a cloudy or overcast day. That is simply how the plant is built, not a fault to be watered away, which makes it better suited to a spot seen in daylight — a rockery, a path edge, a sunny courtyard — than to an evening terrace where the display has already folded up for the day.
Its toughness comes from the same succulent tissue that makes true desert plants work: water stored in the leaves rather than drawn constantly from the soil, which is also why it is one of the few bedding plants here that can rot from kindness, given too much water in a badly drained spot.
Portulaca grandiflora (moss rose) is one of the toughest annual flowers sold in the UAE. Its fleshy, water-storing leaves let it shrug off the peak-summer heat that kills most bedding plants, which is why Dubai Municipality plants it alongside Vinca in its May–June bedding rotation.
It is a low, spreading, red-stemmed plant with cup-shaped single or double flowers in vivid pink, red, orange, yellow and white. The flowers open in full sun and close by late afternoon or on cloudy days — a normal habit built into the plant, not a sign of stress — which makes it a good gap-filler in rockeries, paving joints and containers rather than a plant relied on for evening colour.
It's not the same plant as edible purslane (Portulaca oleracea): moss rose is grown purely as an ornamental and is reported to be toxic to pets if eaten, so don't treat the two as interchangeable regardless of how similar the fleshy leaves look.
Care is minimal as long as it gets full sun and sharp drainage — the same water-storing succulence that gives it such drought tolerance also makes overwatering, not underwatering, the more common way to lose it, since waterlogged roots rot quickly. Left to flower freely it will also self-seed readily in a bed, often returning on its own the following summer without replanting.
Design
Where to use it
GroundcoverGap-filler (paving, rockery)ContainerSummer bedding
Portulaca earns its place in the gaps other plants leave: between paving stones, along a rockery, at the front edge of a bed, or trailing from a container in full, unshaded sun. Because its flowers close by afternoon, site it where it is seen in the morning rather than relying on it for evening colour on a terrace. Sharp drainage matters more than soil richness — a poor, sandy spot that would starve most bedding plants suits it better than an enriched bed that stays damp.
Vinca
Both are Dubai Municipality's summer bedding pairing, so combining them extends the same May–June planting into a wider colour range for the same heat-season bed.
Zinnia
Zinnia's taller, upright flowers give height behind portulaca's low, spreading carpet in a mixed summer border.
Desert Rose
Desert rose's succulent, water-storing character echoes portulaca's own drought strategy, giving a rockery or gravel bed a consistent low-water theme at two different scales.
Care guide
How to grow it in Dubai
- Watering
Summer: Water only when the soil is fully dry, roughly once a week or less — it stores its own water and rots if kept wet.
Winter: Not usually grown outdoors over a Dubai winter, though it can flower year-round in a warm, sunny, dry spot.
Establishment: Keep lightly moist for the first week or two.
- Soil
- Poor, sandy, sharply draining soil is ideal; avoid rich, moisture-retentive mixes.
- Feeding
- Rarely needed; a very light feed at planting is enough.
- Pruning
- None needed; trim lightly if it gets leggy. Deadhead if self-seeding around the bed is unwanted.
- Planting
- Sow or plant out once temperatures are reliably warm, in full sun, spacing 20–25 cm apart.
- Pests
- Generally pest-freeOccasional mealybug
Avoid these
Common mistakes
- Overwatering, especially in a spot with poor drainage. Its succulent leaves already store what it needs; sitting in wet soil rots the roots faster than drought ever stresses the plant.
- Planting it in shade or expecting evening colour on a terrace. The flowers only open in full sun and close by afternoon or on an overcast day — that is normal behaviour, not a problem to fix.
- Enriching the soil before planting, assuming richer is better. Portulaca actually prefers poor, lean, sharply draining ground; an overly rich, moisture-retentive mix promotes rot and leggy growth instead of flowers.
- Confusing it with edible purslane and eating it. Moss rose (Portulaca grandiflora) is a different species from edible purslane (Portulaca oleracea) and is reported toxic to pets if eaten — treat it strictly as ornamental.
Extra notes
Good to know
- It is a different species from the edible purslane sold as a vegetable, and is reported to be toxic to pets if eaten in quantity — don't assume the two are interchangeable because the fleshy leaves look similar.
- Its succulent leaves store water, which is why overwatering, not underwatering, is the more common way to lose the plant.
- Flowers closing by afternoon or in cloudy weather is a built-in trait of the species, not a sign of stress or a watering problem.
- Left to flower freely, it self-seeds readily and often returns on its own in the same bed the following summer.
Toxicity: Reported to be toxic to dogs, cats and horses if eaten in quantity. This is a different species from the edible purslane, Portulaca oleracea — treat moss rose as ornamental only.
Pros
- Extremely drought tolerant — stores water in its fleshy leaves
- Thrives in the hottest months when most flowers struggle
- Vivid range of colours
- Almost no care needed once planted
- Good gap-filler in paving, rockeries and containers
Cons
- Flowers close in shade, cloudy weather and by late afternoon
- Short-lived, one-season annual
- Reported to be toxic to pets if eaten
- Can self-seed around beds if left to set seed
FAQ
Common questions
Why do my portulaca flowers close in the afternoon?
That's normal habit, not a problem — the flowers close in low light, shade or cloud and reopen the next sunny morning.
Is portulaca the same as the purslane I can eat?
No. Moss rose (Portulaca grandiflora) is a different species from edible purslane (Portulaca oleracea) and is grown purely as an ornamental — don't eat it.
How much water does portulaca need in a Dubai summer?
Very little — it stores water in its fleshy leaves and is one of the most drought-tolerant annuals sold here. It rots if kept too wet.
When does Dubai Municipality plant portulaca?
May–June, alongside vinca, as part of the city's summer bedding rotation because both tolerate the peak heat that finishes off winter flowers.
Will portulaca come back on its own next year?
It can. Left to flower freely, it self-seeds readily, and seedlings often appear in the same bed the following summer without replanting, though as an annual it won't survive the cooler months in between.
Not sure how it suits your garden?
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Related plants
Zinnia
Zinnia elegans
Full sunSalt: 2 of 5
Marigold
Tagetes erecta
Full sunSalt: 2 of 5
Desert Rose
Adenium obesum
Full sunSalt: 2 of 5
Native
Sources
- 1. UF/IFAS Extension Charlotte County: Moss rose — the other portulaca
- 2. Gulf News: Dubai set to bloom with over 37m flowers
Last reviewed 2026-09-30 by Ghaf Gardens horticulture desk.
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