Re: explant size?
The bigger the plant, the easier it is to keep it sterile. With a large plant, you can do surface sterilization multiple times while removing layers from around the meristem, but with a plant as small as the ones you want to use, you would have to get it very sterile on the first try and would probably be able to only remove one layer.
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Growing bananas in Colorado, Washington, Hawaii since 2004. Commercial banana farmer, 200+ varieties.
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