| Nobiles have floppy leaves, and Phal types have stiff leathery leaves. Of course there are about a 1000 different Den species, but they are rarely sold at common stores, mostly just the Warm Phal types and less often the nobile types, named after the species dendrobium nobile. If yours is growing, water it well. I don't let growing or blooming Dens of either type go very dry before watering. There is a constant refrain in Baker's book on Dendrobiums, "wet while growing".
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Cynthia
Prescott Orchid Society  |