Sorry to revive such an old thread but I was just wondering are these able to grow so well above water at normal UK humidity. Do they need to be sprayed often?
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Depends on the Echinodorus sp, some do some don't.. Spraying in a living room invironment under artificial light wont make much of a difference. It evaporates again before it has the chance of doing any good..

Than you would realy need a closed system with a hood to keep the air humidity at steady levels. So it's kinda trail and error to find a sp. that aint to fussy about lower air humidities.
Seeing the aboved picture, if that is a E. palaefolius it already answers the question i guess.. Personaly i have the Jungle star cultivar from Dennerle growing like this, it also stands in a pot in the living room and holds on pretty good. Seem more Echinodorus like this, but didn't found out with sp they were.