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darkness period + extended photo period
Steve Pushak wrote:
>The length of the absolute darkness period is important to stimulate
>flowering. My Ocelot sword flowered while I was away for a week and the
>room lights were off all the time.
I believe it depends on the plants. Some are day length sensitive for
flowering, others are not.
I think this even varies amoung the genus Echinodorus. I remember seeing
something about even being able to affect the leaf shape of certain
Echinodorus species by varying the photoperiod.
Aquatic Gardeners Association