The south Indian varieties from Tamil and Madya Pradish would do very well in Sri Lanka. These plants are very vigorous and flower abundantly in India’s hot, dry summers. These varieties are adapted to flower in November and December in India, but with the slightly shorter days in Sri Lanka, they will flower a little earlier, maturing in November.
Other varieties that you also might grow are landraces from Thailand, Cambodia, Jamaica and Brazil and some of the central African countries.
You could try some of the mostly Sativa commercial varieties. These are adapted for higher latitudes so they will flower several months earlier where you are, ripening in September and October. The Haze varieties may also be of some use. However, your best program might be to use well-adapted Sativas and to make your own crosses with Indicas or Indica-Sativa hybrids.
Backcrossing tropical hybrids with Indicas or Sativa-Indica hybrids produce shorter, more controlled plants than the two to three-meter Sativa giants. With 25% Indica heritage, these plants will begin flowering and will mature in October, one to one and a half months earlier than the purebreds.
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