Which small cardamom (choti elaichi) variety and spacing give best yield in the Western Ghats?

Small green cardamom grows in the shaded evergreen hills of the Western Ghats, mainly Idukki in Kerala, parts of Karnataka and Tamil Nadu hills, at around 600 to 1500 metres. Popular high yielding selections include Njallani (Green Gold) and improved released varieties, with Malabar, Mysore and Vazhukka being the main types. Spacing depends on type, commonly around 2 by 2 metres or a bit less for compact types, planted under regulated shade. It needs filtered shade, not deep dark or full sun, and good drainage on slopes. Use healthy suckers or tissue culture plants from a reliable source. For the exact recommended variety and spacing for your estate, confirm with the Spices Board Cardamom Research Station or your KVK, since recommendations are updated.