I believe the correct spelling is Lesniewicz.
Very few people are aware that Lesniewicz was a businessman, not a bonsai
grower, and his book was actually ghostwritten by several assistants. The
sections on individual species are sometimes helpful, but the chapter on general
cultural instructions is full of errors.
You are right that much of the information on indoor climates in Europe is
not applicable to the US, especially the Northeast. However, remember that
Lesniewicz advises the reader to grow subtropicals and half-hardy species in what
he calls a "winter garden," which in this country would be an unheated or
slightly heated conservatory, sunporch, or atrium, quite suited to temperate
species which are not hardy outdoors. Pseudolarix might do very well there. What
zone is it supposed to be hardy to?
Iris

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