Kikar

Gum arabic tree (Acacia nilotica, now often treated as Vachellia nilotica) is a thorny, nitrogen-fixing legume tree of dry Africa and Asia, also known by common names such as babul and kikar.¹²³ It is native to a broad belt running from Senegal across to Egypt and south to South Africa, and eastward through the Middle East to India and Bangladesh, with one subspecies account also listing parts of the Arabian Peninsula and the Indian Ocean region.²³ For a homesteader on hard, dry, or salt-affected ground, its appeal is that it tolerates drought, grazing, fire, and saline soils while fixing nitrogen and yielding timber, fuelwood, fodder, gum, and tannin — but, as set out below, it is an aggressive seeder that has become a serious weed outside its home range, so plant it with real caution.²³⁴

The species is variable in form. It is frequently a medium-sized tree but can reach roughly 20 to 25 m, typically with a short bole, low branching, a dense crown, rough furrowed bark, and the paired thorns characteristic of the group.¹²³ Botanists divide it into nine subspecies, which accounts for much of the variation you will see described in different references.¹³

Growing Acacia nilotica

This is a pioneer, light-demanding tree that is relatively fast-growing on arid sites, which is exactly why it is so widely used on degraded land.²³ It tolerates drought, grazing, fire, and saline soils, and is commonly planted on degraded saline and alkaline ground as well as in windbreaks and avenue plantings.²³ Its strong light requirement means it will not thrive in shade, so give it an open, sunny position.³

On climate, the sourced figures vary by reference and taxonomic treatment, so treat them as broad ecological guidance. One subspecies account places its mean annual temperature at about 4 to 47°C and annual rainfall at about 200 to 1,270 mm, while another describes it as thriving at roughly 15 to 28°C, able to withstand up to 50°C, but sensitive to intense cold.¹³ The consistent caution across sources is that severe frost damages seedlings and even larger trees.¹³ The reliable sources here do not assign USDA hardiness zones to this species, so none are claimed.²³

Propagation is straightforward. A. nilotica is a prolific seeder, its seeds can remain dormant in the soil for long periods, and it is considered easy enough to propagate that it became widely planted in farm systems across its range.² The sources here do not give dependable, species-specific figures for sowing depth, seed pretreatment, spacing, irrigation, or time to first harvest, so those are left out rather than stated with false precision.²³

Harvest and uses

The tree is valued for a wide spread of products: timber, fuelwood, fodder, tannins, gum, and green manure or protein supplement.¹² CABI identifies it as an important farm tree on the Indian subcontinent and a source of forage in pastoral systems.² The sources provided do not give dependable quantitative yield figures, so no yield numbers are quoted here.¹²

In agroforestry it earns its place by fixing nitrogen, rehabilitating degraded saline and alkaline soils, serving as a windbreak or avenue tree, and acting as a forage and green-fertiliser species.¹² Its material uses — timber, fuelwood, fodder, tannin, and gum — make it a genuinely multipurpose dryland tree.¹² Culinary use is not clearly documented in the sources here, so none is asserted.¹²

Invasive risk and weed status

This is the most important practical caution before you plant. The same traits that make Acacia nilotica useful on degraded land — thorny, prolific-seeding, long-lived in the seedbank — also make it invasive outside its native range, where it can form dense thickets.²⁴ It has been added to the U.S. Federal Noxious Weed list and has been introduced into several U.S. jurisdictions.²⁴ If you are anywhere it is not native, check your local regulations and weed lists before establishing it; in many places planting it is restricted or unwise, and its persistent seedbank makes it very hard to remove once established.²⁴

Safety and cautions

Acacia nilotica has a long history in herbal medicine, reportedly used for respiratory, gastrointestinal, and urogenital complaints, and as an emollient, antidiarrhoeal, astringent, and antidote for bite poisons.¹ A review of the species reports low toxicity in the studies examined, but it also stresses that human clinical trials are scarce, so efficacy and safety are not fully established.¹

This profile makes no medical claims and gives no dosages. The sources here do not provide a species-specific list of who should avoid it, what drug interactions to watch for, or which plant parts may be hazardous, so those are not stated rather than invented.¹ The grounded caution is simply that the medicinal reputation rests mainly on traditional and preclinical evidence rather than robust human trials, so any use should be approached conservatively and with qualified guidance.¹

Sources

1. Acacia (Vachellia) nilotica review — PMC (National Library of Medicine)
2. Vachellia nilotica datasheet — CABI Digital Library
3. Acacia nilotica subsp. nilotica — World Agroforestry (Agroforestree Database)
4. Acacia nilotica, U.S. Federal Noxious Weed — IdentificationTechnology Program (USDA APHIS / ID Tools)
5. Acacia nilotica — JSTOR Global Plants
6. Babul (Acacia nilotica) — Feedipedia (INRAE-CIRAD-AFZ-FAO)