Many stems plants can generate new growth from just a small peice of stem if the conditions are favorable and you are patient. This is why even when you may aquire plants that arrive mostly gone by, you may be able to salvage some bits and peices and grow them out. This is also how aquarium plants have escaped and invaded our natural lakes and streams.
Rhizomes are tuberous and can generate growth even from bits and peices of a broken rhizome. This is why if a Cryptocoryne has a total leaf melt down, it can be grown over again from the rhizome as long as the rhizome has not started to rot. Some plants can generate daughter plants from rotting leaves, such as Java fern. The leaf can be totally black but still contain spores that will sprout new plants. All it needs is light and water.
Robert Paul Hudson
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Kindness like love is unconditional