A garden oasis and cultural center overlooking the Hudson River

Plant of the Week: Isodon longitubus (syn. Rabdosia longituba)

Charles Day is Wave Hill’s Ruth Rea Howell Senior Horticultural Interpreter.

Isodon longitubus is an unusual and enigmatic perennial. Through the summer, when it looks like any slightly rangy-looking green plant, it is easily overlooked but, late in the fall, it burst out with masses of tiny, tube-shaped blue flowers.

close-up-1 plant-1

This blue is a wonderful contrast against the fall oranges, reds and yellows of the surrounding trees in our Shade Border. Find it next to the path, just by the service gate.


It is native to the wooded mountains in Japan and is similar in appearance to its more sun-loving cousins, the sages (Salvia spp.).

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