To sow, the smaller seeds should be sown in a light but rich starting medium buried shallowly beneath the surface of the soil::Cardamom requires steady supply of moisture and will not tolerate drought::If growing in a greenhouse, it should be kept humid and maintained carefully::Cardamom is not tolerant of cold, but should be kept in a location with many hours of partially occluded sunlight::Cardamom requires approximately 3 years of growth to produce capsules containing seeds::After the flowers mature, they will gradually dry out as capsule develops::These can be collected when capsules begin to turn green, and later dried on screens over the course of 6-7 days. Turn frequently.Cardamom (Elettaria cardammommum) is a perennial plant. It has rigid and erect aromatic leaves, which forms the aerial part of the plants stems. These stems are between 2 to 4 meters high and forms a canopy of leaves around the plant.You can propagate cardamom from seeds. You can try seeds you get from glossary store but those seeds are generally treated and not fresh.