Photo: SAplants / CC BY-SA 4.0 / Wikimedia Commons

TreeExotic

Parkinsonia

Parkinsonia aculeata

شوك القدس

A fine-leaved, thorny desert tree with green stems and fragrant yellow spring flowers, very drought and salt tolerant; it is short-lived, spiny, and a known invader in several countries.

Mature size4–7 m tall, 4–7 m spreadGrowthFastSunFull sunWaterLow

Heat: 5 of 5

Salt: 4 of 5

Drought: 5 of 5

Shade: 1 of 5

Ease of care: 3 of 5

Use in a design Get it looked after

Parkinsonia is a tough, light-canopied desert tree, but it is a documented invader: it is a Weed of National Significance in Australia, University of Florida predicts it will be invasive and does not recommend it, and a study of Fujairah's invasive flora lists it among species found in private and municipal plantings. Its long-lived seed is spread by water and it carries sharp spines. If you plant one, keep it away from drains, wadis and watercourses, remove seed pods before they split, and consider native alternatives such as ghaf, samr or sidr.

Season

Through the Dubai year

How Parkinsonia 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°

40°

36°

31°

27°

Best planting window

Oct – Dec

Jan – Mar

Fresh fine foliage returns

Fragrant yellow flowers with a red marking

Mar – May

Seed pods form

May – Jul

Structural pruning

Best planting window: Oct–Mar
Plant in the cool season into free-draining soil, away from drains and watercourses.
Fresh fine foliage returns: Feb–Mar
Fragrant yellow flowers with a red marking: Mar–May
University of Florida places bloom in spring; UAE timing is not well documented.
Seed pods form: May–Jul
Remove pods before they split to limit self-seeding; the seed stays viable for many years.
Structural pruning: Dec–Feb
Needed for strong structure; wear gloves and eye protection, since the spines are sharp.

University of Florida describes parkinsonia as deciduous, so the canopy thins at some point in the cool season and renews with fine new foliage in late winter and early spring. Spring is the main event: drooping clusters of bright yellow flowers with a red or orange marking, slightly fragrant, open against the lacy foliage, and seed pods form behind them from early summer. The rest of the year the tree is light, open and low in water demand, which makes winter the best time for structural pruning and for pulling any seedlings that have come up beneath it.

Meet the plant

Meet the Parkinsonia

Meet parkinsonia, a tree that looks like a haze of fine green lace. Its leaves are tiny leaflets strung along flat, slender stalks, and the crown is so open that sunlight filters straight through it. In spring it fills with drooping clusters of fragrant yellow flowers with a red or orange marking, a bright, frothy effect against bare sand and gravel.

That airy look is a desert tree's economy. Tiny leaflets and green, photosynthetic stems keep water loss low, and University of Florida rates both the tree's drought tolerance and its salt tolerance as high.

The same toughness is the reason to be careful. A mature tree makes thousands of seeds, which stay viable for years and float, and in Australia the tree has become one of the country's worst weeds. In a Dubai garden it is a good-looking specimen only if you keep it contained, manage the pods, and accept sharp spines and a modest lifespan.

Parkinsonia aculeata, the Jerusalem thorn or Mexican palo verde, is a fast-growing, multi-trunked tree from Central America, Mexico and South America. University of Florida describes it growing 15 to 20 feet (about 4.5 to 6 m) tall and 20 to 25 feet wide, deciduous, with a light, airy, low-branching crown, short sharp spines along the stems, and bright yellow flowers with a red centre, slightly fragrant, in drooping clusters in spring. Pods 1 to 6 inches long follow.

Its toughness is real. University of Florida rates its drought tolerance and salt tolerance as high, and notes tolerance of clay, sand, loam and alkaline soil, provided drainage is good, while Abu Dhabi Municipality's 2012 plant index lists it among both salt-tolerant and drought-tolerant trees. It dislikes wet, soggy soil, and in dry Dubai gardens that is the main way to lose it. Its open canopy gives dappled, not dense, shade, which suits desert-modern planting with grasses and succulents beneath.

The drawbacks are on the record. University of Florida rates it invasive and not recommended, notes thin bark that is easily injured and compartmentalises decay poorly, and puts its lifespan at about 15 to 20 years. In Australia it is a Weed of National Significance, with a typical mature tree making about 5,000 seeds a year, pods that float, and seed that stays viable for many years. A study of invasive flora in Fujairah also lists it among species found in private and municipal plantings. It is a tree to use with eyes open.

Design

Where to use it

Desert-modern specimenLight dappled shadeLow-water accent

Use parkinsonia where a fine, translucent canopy is wanted over gravel, grasses and succulents, in a dry, sunny, well-drained spot well away from drains, wadis, ponds and watercourses. Keep it clear of paths, seating and play areas because of its spines, and out of any area that is regularly irrigated, since wet soil is what kills it. Plan to sweep up fine litter and pull seedlings, and to replace the tree after about 15 to 20 years.

Texas Sage

Texas sage's silver foliage sits well beneath parkinsonia's fine green canopy, and both want sharp drainage and little water.

Agave

Agave's bold blue-grey rosettes beneath parkinsonia's lace-like canopy give a strong contrast of form in a dry, sunny bed.

Desert grass

Native desert grass can grow under the light, filtered canopy, building a naturalistic, low-water scheme.

Care guide

How to grow it in Dubai

Watering: Summer: Very little once established; University of Florida rates its drought tolerance as high, and overwatering is the more likely problem.
Winter: None or minimal.
Establishment: Water regularly through the first year so the roots establish, then taper off; do not let the root ball sit wet.
Soil: Well-drained soil; University of Florida lists tolerance of clay, sand, loam, alkaline and acidic conditions, and notes it is intolerant of wet, soggy soils.
Feeding: Not required; feeding mainly pushes weak, fast growth.
Pruning: Structural pruning is needed while young, in the cool season, wearing gloves and eye protection. Thin bark is easily injured, so avoid wounds and make clean cuts. Remove seed pods before they split.
Planting: Plant October to March in full sun and free-draining soil, well away from drains, wadis and watercourses, and away from paths and play areas.
Pests: Generally trouble-freeRoot rot in wet soil

Avoid these

Common mistakes

Planting it beside a drain, pond, wadi or other watercourse. Its pods float and seed spreads by water, and the tree is a known invader in several countries.
Letting seed pods split and seedlings build up. The seed stays viable for many years, so remove pods and pull seedlings while they are small.
Putting it on an irrigated lawn or in a wet bed. It is intolerant of wet, soggy soil, and root rot is the usual way it fails.
Planting it beside a path, seating area or play space. The spines are short and sharp and the tree sheds fine litter.
Treating it as a permanent legacy tree. University of Florida puts its lifespan at around 15 to 20 years, and the thin bark heals poorly.

Extra notes

Good to know

University of Florida's non-native plant assessment gives it a high invasion risk across Florida and recommends against using it, though limited use is allowed in particular cases under approved management.
Weeds Australia notes it was introduced in the 1890s and early 1900s as an ornamental and shade tree, and it is now a Weed of National Significance, declared across Australia's states and territories.
A study of invasive flora in Fujairah identified private and municipal plantings as key sources of invasive plants, naming Parkinsonia among the species found; permanent water was reported as the main limit on their spread.
Abu Dhabi Municipality's 2012 plant index lists Parkinsonia aculeata among salt-tolerant and drought-tolerant trees, which explains why it was widely planted; tolerance of harsh conditions is not the same as being safe to plant.

Toxicity: No toxicity is reported in the sources consulted; the hazard is physical, from sharp spines along the stems.

Pros

Very drought and salt tolerant once established
Light, airy canopy with fine leaves and fragrant yellow spring flowers
Fast growing, making a small shade tree quickly
Tolerates clay, sand, loam and alkaline soil; roots not reported as a problem
Few pests and diseases

Cons

Weed of National Significance in Australia; rated invasive in Florida
Sharp spines along the stems; keep away from paths and play areas
Short-lived, about 15 to 20 years in University of Florida's description
Thin bark is easily injured and heals poorly, so wounds invite decay
Seed stays viable for years, and seedlings must be pulled

FAQ

Common questions

Is parkinsonia invasive in the UAE?

It is a documented invader elsewhere. In Australia it is a Weed of National Significance, and University of Florida predicts it will be invasive and recommends against it. A study of invasive flora in Fujairah lists it among species found in private and municipal plantings. Keep it away from water and manage seed pods.

What can I plant instead of parkinsonia?

Ghaf, Samr and Sidr are native desert trees that give light shade and handle heat, drought and salt, without the invasive record. All three are slower to establish.

How long does a parkinsonia tree live?

University of Florida describes a short lifespan of about 15 to 20 years. The thin bark is easily injured and heals poorly, so plan for eventual replacement.

How much water does parkinsonia need?

Very little once established. University of Florida rates its drought tolerance as high, and it is intolerant of wet, soggy soil, so overwatering is a bigger risk than drought.

Is parkinsonia safe near children?

The main hazard is physical: it has short, sharp spines along the stems, and sources consulted report no particular toxicity. Keep it away from paths, seating and play areas.

Not sure how it suits your garden?

Ask about Parkinsonia on WhatsApp