Tree Plantation and Green Belts in Ahmedabad

Prosopis cineraria, native to the arid tracts of western India that include Gujarat, survives on as little as 150 mm of rain a year and tolerates saline, alkaline soil, both of which describe stretches of ground around Ahmedabad's older industrial estates better than a generic species list does. It is a strong candidate where the boundary soil itself is the first obstacle, ahead of any pollution load.

Delonix regia, the gulmohar, prefers exactly the open, well-drained sandy or loamy soil that much of Ahmedabad sits on, sheds its leaves in the driest months to cut its own water use, and grows into a broad canopy that gives shade rather than a narrow screen. It suits the inner rows of a belt more than the dust-facing boundary line.

Planting on the calendar the weather sets

New rows go in at the start of the monsoon, mid-June to mid-September, when about 800 mm of rain falls in a normal year, or are held until after the worst of the summer heat if the site cannot be watered daily through May and June. A belt planted in April, against an average high of 43°C, needs far more first-year watering than the same rows planted in July.

Older estates retrofit a green belt, newer ones plan it in from day one

Naroda's estate grew from an agricultural village into today's mixed base of textile, pharmaceutical, food-processing and engineering units from the 1980s onward, largely before green-belt conditions were a standard part of every consent, so a green belt there is often being fitted onto a plot with no space set aside for it originally.

A newer plant on Sanand's industrial estate, developed from the mid-2000s onward, more often has the green-belt area designed into the layout from the start, which changes the planting plan from a tight boundary strip to a proper set of rows.