The Cycad Bulletin Board
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Re: Premature hardening of new leaves
Posted by Tom Broome on 9/28/2009, 1:46 pm, in reply to "Premature hardening of new leaves"
: Several of the leaves pushed up by my
: cycad seedlings have hardened off
: before they are fully unfolded. My
: assumption was that this is caused
: by high summer temperatures
: (>110° F) but there doesn't seem
: to be consistency even within
: seedlings of the same species.
: Would temperature be the most likely
: cause or might it be something else?
: I would appreciate your advice.
It is most likely stress or lack of energey, but it doesn't mean it was just from the heat alone. Each seed is feeding the seedling to be. If the connection isn't the best, if the endosperm is not as full, if there is any damage at all to the seed, these short first leaves can happen. It might just be the heat and the amount of water the seedlings are getting while the new leaves are being pushed out. Since they do better when they get extra water while pushing leaves, this is also another possibility. All can be a reason and there might be different reasons for some of those seedlings and other reasons for a few of the others. You really can't assume anything for 100%.
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