I have seeds from wild banana (probabaly M. acuminata) from the jungles of Singapore, some pics:
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Anyone want some seeds? The climate here is hot and humid (33C, 90% humidity) so not sure if they will grow in temperate regions. The soil is laterite clay with a surface layer of humus, but bananas will grow in just about any soil as long as it isn't too dry. They like a lot of water. The banana plants grow to about 3-4 m tall.