Elettaria cardamomum

This is the plant which the true Cardamom pods come from. The leaves are very aromatic too and exude the fragrance of cardamom when bruised. It makes an attractive houseplant or specimen for a conservatory in its own right. In summer water regularly and feed every month with a general purpose feed. Grow in a good loam based compost - John Ines No.3. This will retain the moisture better than peat based compost.

If you're hoping to harvest pods for cooking just be aware the UK climate is not ideal. You will need to grow this plant somewhere very warm and fairly humid to get it to flower (and in turn set the seed pods) Realistically you need a nice warm conservatory or greenhouse but with some shading to protect it from really hot sun. If you can't damp the floors down then stand some shallow bowls of water around to humidify the air. This plant comes from tropical Southern India so these are the conditions you want to try to replicate as best you can. If it does flower move it outside (providing it's not cold) so Bees and other insects can pollinate the flowers otherwise you may not get any seeds set. 

If this all seems too much effort then you can just enjoy the fragrance of cardamon as you brush the leaves your conservatory will smell very exotic!