Senna corymbosa (Lam.) H.S.Irwin & Barneby

Argentine Senna, Cassia, Shower Tree




Family: Leguminosae

Genus: Senna

Category: Shrub - Evergreen

Zones: 8 to 11

Size: 6 to 8' tall and 3 to 4' wide

Growth Rate: Moderate

Exposure: Sun, Filtered Sun, Part Shade


Upright form with feathery compound leaves. Pendulous clusters of yellow flowers from the leaf axils in summer and autumn.


Published in Mem. New York Bot. Gard. 35: 397 in 1982.

Basionym is Cassia corymbosa Lam.

Member of the pea family. Introduced to the US from Argentina.


My Experience: 

Rooted a seedling in autumn 2007 in a pot and overwintered it in the garage. It grew quickly in 2008 and was left outside in a very sheltered location that winter. Planted in the corner of the Courtyard in summer 2009. It had a hard time rooting sufficiently to stay upright and had to be heavily staked. Removed the stakes in spring 2010 but it was not stable. Produced many seedlings in the Courtyard. One of these and the main plant were transplanted to the side of the garage in late spring but the main plant did not recover well from the transplanting and was thrown out. The other seedling was planted on the right property line in the 'Wild Or Wacky' garden and has performed well, blooming in late August 2011 for the first time. By the end of summer 2012 it was about 6' tall and wide and blooming profusely. It has performed well each year.

Sources of Information

© 2010-12 Lisa J. Miner