Flowers bloom in April and seeds have two wings to spread from wind.

D. zeylanicus can be found in moist low country like Ratnapura, Kaluthara, Galle and Matara Districts and also in the Sinharaja rain forest.

The tallest (nearly 60 m (200 ft)) trees of Hora in Sri Lanka are found in Udakiruwa village in Lunugala and under great threat of legal/illegal felling.

Even Tamil place names like Norochcholai (where a controversial coal power plant in Sri Lanka is located) is said to refer to a clump of Hora trees - i.e., "Horagolla" in Sinhalese.

After a preservative treatment, it is used for railway sleepers, rafters, electric posts, beams, joists, heavy types of carpentry work, and eminently suitable for underwater work.