from Throstur Eysteinsson:

Looked at the kastanias yesterday, the tallest ones are about 80 cm.
They are outside full-time now but still show no sign of stopping
growing (we eased them gently outside by putting them outside only
for short periods to begin with and then lengthing the outside time
gradually - that way they did not get a brightness/temperature
shock). The temperature is around 20°C every day now so they realy
haven't gotten any cool weather yet (cool by Icelandic standards, not
New Orleans standards that is).

And an earlier message:

The kastanias are doing well. They got a little spindly in the hot
greenhouse and some of them flopped over. They have been tied to
bamboo poles now and are kept outside.
Alan

BTW, Kastania is the new Icelandic word for American Chestnut,
Castanea Dentata.
Icelanders prefer their own words, not imported ones, even if they
have to make one up :-)