I am currently growing my java ferns (broad leaves, narrow leaves, windelov, etc) in temperature 24-26 or 25-27.
But in another tank (not mine), some java plants are surviving at temperature of 28-30 for a period of more than 6 months now. Their growt in that tank is limited by other factors.
So to answer your question, yes i will think java fern can be grown in temperature 29-30.
wait for others to comment more!
Christophe
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