Tomohiro Masumi watering Shohin bonsai at Koju-en in Kyoto. From Shohin Bonsai by Morten Albek. Yet Another Watering Problem… The following is by Michael Hagedorn from his website Crataegus Bonsai. Probably the worst thing we might encounter when we have a hose in our hand is a tree that, when we think about it, has not dried out in three days of sunny summer weather. That ought to send off all kinds of alarm bells in your head. If none go off, install some.