The type of soil has a pronounced effect on the quality of the bark. In Sri Lanka the best cinnamon grows around Negombo in the Colombo District of the Western Province in fine white quartz sand.

The other main cinnamon area is the Galle and Matara Districts of the Southern Province, where the lateritic gravelly soil of the low country produces more rapid growth, but the bark obtained is somewhat thicker and coarser than that of the Negombo District. Rocky and stony ground is unsuitable. Waterlogged and marshy areas should be avoided, as they give an undesirable bitter product which is much less aromatic.

Several cultivars with distinctive local names exist in Sri Lanka. The forms recognized by growers include sweet or honey cinnamon, snake cinnamon, camphor cinnamon, astringent cinnamon, mucilaginous cinnamon, wild cinnamon and bloom cinnamon. Their characteristics are not given, but of these only sweet or honey cinnamon is cultivated extensively.

It is the dominant species of the secondary vegetation of the higher and middle slopes. It also occurs and is sometimes planted in the coconut plantations and is also found in the calcareous coastal flats. Mahe is by far the largest producer, as the very steep rocky terrain of Silhouette makes exploitation difficult.

On the smaller islands of Praslin and La Digue, where cinnamon occurs and is exploited, rainfall is only about 1 270 null, with the result that cinnamon is very slow in spreading and is far from abundant.

Athough there are months in which there is less rain, no prolonged dry season occurs and rain is received on about 150 days per year. The crop grows best below 500 in altitude.