# Samr (Vachellia tortilis)

Canonical: https://plantguide.ae/plants/samr · Updated: 2026-09-30
Source: Ghaf Gardens (https://plantguide.ae/plants/samr)

Samr · سمر · also called Umbrella thorn, Umbrella thorn acacia  
tree · native · family Fabaceae · grows 4–10 m tall, 5–12 m wide · slow growth  
full sun · very low water need  
Ratings for Dubai (1–5, 5 is best): heat 5 · salt 4 · drought 5 · shade 1 · ease of care 4  
Sow or plant: Oct–Feb  
Uses: shade-tree, windbreak, native-habitat, specimen  
Garden styles: desert-modern

A native, umbrella-canopied acacia that shrugs off Dubai's heat, drought and saline soil, and is one of the trees Abu Dhabi is actively re-planting and protecting in the wild.

## About

Meet Samr, the tree that is the desert's own umbrella. Its flat, wide crown of fine, feathery leaflets casts a dappled rather than dense shade, letting light through in moving patterns rather than blocking it outright — a very different mood to the solid canopy of an exotic shade tree. It is unmistakably of this place: the same silhouette you see scattered across a gravel plain or a wadi floor, now standing in a garden instead.

Every part of it reads as adaptation rather than decoration. The long, straight thorns, the tiny leaves, the roots that reach deep for water most plants can't find — none of it is there for effect, and all of it is what lets Samr shrug off a Dubai summer that would finish off almost anything else. In late spring its small cream-white flower clusters bring a soft, honeyed scent and a quiet hum of native bees, a genuinely wild note in a cultivated space.

It is not a fast or showy tree, and its thorns mean it asks to be sited with care. What it offers instead is authenticity: a living piece of the Arabian desert, unhurried and self-sufficient, that asks almost nothing of the garden around it.

Samr (formerly classified as Acacia tortilis) grows wild across the UAE's gravel plains and mountain wadis, its flat, wide-spreading crown a defining silhouette of the Arabian desert. Alongside [Ghaf](https://plantguide.ae/plants/ghaf.md) and [Sidr](https://plantguide.ae/plants/sidr.md) it is one of the native trees the Environment Agency – Abu Dhabi tags and rehabilitates in the wild through its native tree-tagging programme, and its nectar is a key ingredient of high-quality UAE honey, feeding native bees such as Apis florea in an otherwise florally scarce landscape.

Its adaptations are built for extreme conditions: long straight thorns and small, feathery leaves cut water loss and browsing pressure, while deep, wide-searching roots reach groundwater far below the surface. It tolerates temperatures from near freezing to over 45°C and grows in stony, saline ground that would stop most other trees outright. Flowering follows the wider Vachellia tortilis pattern recorded across its native range — small, fragrant cream-white puffball clusters in the drier part of spring into early summer — though exact UAE timing is not closely documented and varies with local rainfall.

In a garden it gives light, dappled shade over a footprint often wider than the tree is tall, and suits a desert-modern scheme alongside [Sidr](https://plantguide.ae/plants/sidr.md), [Arak](https://plantguide.ae/plants/arak.md) and [Date Palm](https://plantguide.ae/plants/date-palm.md). It is slower-growing and harder to source from UAE nurseries than popular exotics, but for a genuinely native specimen tree or windbreak it is hard to beat.

Beyond its own garden value, Samr does quiet ecological work: as a nitrogen-fixing legume it improves the soil it grows in, and its canopy and thorny structure offer the kind of shelter and forage that imported ornamental trees cannot replicate for local birds and insects. Planting it is as close as a Dubai garden gets to restoring a fragment of the natural desert plain.

## Through the year

Samr holds its fine, feathery foliage through most of the year, with a fresh flush of growth after the cool season in March and April giving the flattest, most umbrella-like crown shape. Small cream-white, honey-scented flower clusters appear in late spring into early summer, drawing native bees at a time when little else nearby is flowering. Tightly coiled, twisted seed pods follow through summer and into winter, often still hanging on the tree well into the cool months — a useful identifying feature even without flowers. Through peak summer heat it simply holds steady, neither growing fast nor showing stress.

| When | What | Note |
| --- | --- | --- |
| Oct–Feb | Plant: Best planting window |  |
| Mar–Apr | New growth: Fresh feathery leaf flush after winter |  |
| May–Jun | Flowers: Small white, sweetly scented flower clusters | Species-wide records show flowering peaking in early summer with pods maturing by winter; local UAE timing is not well documented, so treat this as indicative. |
| Jul–Dec | Fruit: Tightly coiled seed pods form and mature | Pods are often still present through the cool season. |
| Dec–Feb | Prune: Careful formative pruning | Remove damaged or crossing thorny branches in the cool season; heavy gloves are essential. |

## Care in Dubai

- **Watering in summer:** Established trees rarely need supplemental water beyond an occasional deep soak.
- **Watering in winter:** None needed beyond natural rainfall.
- **While establishing:** Deep-water weekly for the first one to two years while the taproot develops.
- **Soil:** Any free-draining soil, from deep sand to rocky gravel; tolerates saline and alkaline ground.
- **Feeding:** Not required; like other Fabaceae it fixes its own nitrogen.
- **Pruning:** Minimal. Remove damaged or crossing branches in the cool season and wear thick gloves for the thorns. Avoid heavy pruning, which the slow-growing crown takes a long time to replace.
- **Planting:** Plant October to February from a nursery-grown specimen; stake loosely until the root system is established.
- **Pests and problems:** Generally trouble-free; Occasional borer damage in stressed trees
- **Toxicity:** Not known to be toxic, but the long thorns are a real physical hazard, especially around children and pets.

## Good and bad

**Pros**
- Handles Dubai's full summer heat and drought once established, needing almost no irrigation
- Genuinely native: supports the same insects, birds and beekeeping traditions as wild desert stands
- Wide, flat umbrella canopy gives dappled shade over a bigger footprint than most UAE natives
- Deep roots and nitrogen fixing improve the soil beneath and around it

**Cons**
- Long, sharp thorns on every branch; plant well away from paths, pools and play areas
- Slow growing, especially in its first years while the root system establishes
- Harder to source from UAE nurseries than popular exotic trees
- Prunings and thorny litter need careful handling and disposal

## Common mistakes

- Planting it near a path, gate or play area without allowing for its eventual spread — the thorns are sharp and unforgiving, and a tree that looked small at planting can encroach on a walkway within a few years.
- Watering it on the same frequent schedule as exotic ornamentals — Samr is built for drought, and overwatering an established tree can encourage shallow roots and disease rather than helping it.
- Pruning hard for a tidier shape — it is slow-growing and a heavy cut takes years to fill back in, so limit pruning to removing damaged or crossing wood.
- Expecting fast results — it is one of the slower trees to size up in this list, and a small nursery specimen can take several years to give meaningful shade.
- Handling prunings without thick gloves — the thorns are long, rigid and genuinely painful, and cut branches stay hazardous until disposed of.

## Good to know

- One of the UAE's protected native trees: the Environment Agency – Abu Dhabi tags and rehabilitates wild Samr alongside Ghaf and Sidr as part of its native tree programme.
- Its nectar is a key source for prized regional honey, supporting native bee species such as Apis florea in an otherwise nectar-scarce desert landscape.
- As a legume, it fixes atmospheric nitrogen through its roots, gradually improving the poor desert soil it grows in without any feeding.
- Slow growth means the largest nursery specimen affordable is worth the extra cost if a quicker result is wanted.

## Using it in a garden

Roles: Specimen tree, Windbreak, Native habitat planting, Shade tree

Site Samr well away from paths, seating, pools and play areas — the thorns are long, sharp and present on every branch, so treat clearance as a safety requirement, not a design preference. It rewards a prominent, sunny position where its wide, flat canopy and dappled shade can be appreciated from a distance, as a specimen on an open lawn edge or as part of a windbreak line along a boundary. It needs no irrigation infrastructure once established, so it suits the driest, most exposed part of a desert-modern garden that other trees would struggle with.

- [Ghaf](https://plantguide.ae/plants/ghaf.md): Both are deep-rooted native legumes with a similar dappled canopy, giving a cohesive, authentic desert-modern planting when grouped together.
- [Sidr](https://plantguide.ae/plants/sidr.md): Sidr's denser, thornier crown and Samr's flatter, wider one combine for varied shade and silhouette while sharing the same very low water needs.
- [Arak](https://plantguide.ae/plants/arak.md): Low, shrubby arak works well beneath Samr's high, dappled canopy without competing for the tree's deep water reserves.
- [Date Palm](https://plantguide.ae/plants/date-palm.md): A date palm's vertical form contrasts with Samr's horizontal spread, and both tolerate the same saline, low-water desert-modern conditions.

## FAQ

**What is the difference between Samr and Ghaf?**  
Both are native, deep-rooted, very low-water trees, but Samr has a flatter, wider umbrella-shaped crown and long straight thorns, while Ghaf has a more open, upright form and much smaller thorns. Samr generally gives denser dappled shade over a wider footprint.

**Is Samr safe to plant near a pool or path?**  
Keep it well back. Its thorns are long and sharp, so site it away from pools, paths, seating and play areas, and prune only with thick gloves.

**Why is Samr being replanted in Abu Dhabi?**  
The Environment Agency – Abu Dhabi runs a native tree-tagging and rehabilitation programme covering Ghaf, Samar and Sidr, protecting wild stands and their habitats against climate pressure and human encroachment.

**How much water does Samr need in a home garden?**  
Very little once established. Like other deep-rooted UAE natives, an occasional deep soak is generally enough outside the establishment period.

**Why does my Samr grow so slowly?**  
Slow growth is normal and part of how it survives — energy goes into establishing a deep root system before the canopy expands. Resist the urge to force growth with extra water or feed; it won't speed the tree up and may do more harm than good.

## Related plants

[Ghaf](https://plantguide.ae/plants/ghaf.md) · [Sidr](https://plantguide.ae/plants/sidr.md) · [Arak](https://plantguide.ae/plants/arak.md) · [Tamarisk](https://plantguide.ae/plants/tamarisk.md) · [Date Palm](https://plantguide.ae/plants/date-palm.md)

## Photos

![UAE native tree.Vachellia tortilis](https://upload.wikimedia.org/wikipedia/commons/c/c5/Vachellia_tortilis.jpg)  
Photo: Asima Bibi / CC BY-SA 4.0 / Wikimedia Commons ([source](https://commons.wikimedia.org/wiki/File:Vachellia_tortilis.jpg))

![Foliage and pods of an Umbrella thorn in the Wonderboom Nature Reserve in Pretoria](https://upload.wikimedia.org/wikipedia/commons/e/ea/Acacia_tortilis_subsp_heteracantha%2C_loof_en_peule%2C_Wonderboom_NR%2C_a.jpg)  
Photo: JMK / CC BY-SA 3.0 / Wikimedia Commons ([source](https://commons.wikimedia.org/wiki/File:Acacia_tortilis_subsp_heteracantha,_loof_en_peule,_Wonderboom_NR,_a.jpg))

![Vachellia tortilis (syn. Acacia tortilis)](https://upload.wikimedia.org/wikipedia/commons/c/ca/Vachellia_%28ex_Acacia%29_tortilis.jpg)  
Photo: Robur.q / CC BY-SA 3.0 / Wikimedia Commons ([source](https://commons.wikimedia.org/wiki/File:Vachellia_(ex_Acacia)_tortilis.jpg))

![Vachellia tortilis, widely known as Acacia tortilis but now attributed to the genus Vachellia and it is Native Tree o...](https://upload.wikimedia.org/wikipedia/commons/9/90/Vachellia_tortilis_%28Acacia_tortilis%29.jpg)  
Photo: Asima Bibi / CC BY-SA 4.0 / Wikimedia Commons ([source](https://commons.wikimedia.org/wiki/File:Vachellia_tortilis_(Acacia_tortilis).jpg))

## Sources

- [EAD: Native Tree-Tagging Programme (Ghaf, Samar and Sidr)](https://www.ead.gov.ae/en/Media-Centre/News/Tree-Tagging-Programme-2024)
- [PMC: Ecological, Apicultural, and Therapeutic Value of Vachellia tortilis and Ziziphus spina-christi Honeys in the UAE](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12385906/)
- [Kew Science, Plants of the World Online: Vachellia tortilis](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77087190-1/general-information)
- [PlantZAfrica: Vachellia tortilis](https://pza.sanbi.org/vachellia-tortilis)