Jul 21st, 2013

Did you know?

by Sue Key,  Lewis Ginter Botanical Garden, Volunteer Garden Guide

Chaste tree 'Shoal Creek'. Notice the upright form & palmate leaves.

Chaste tree, Vitex agnus-castus ‘Shoal Creek’. Notice the upright form & palmate leaves.

…..That the small blue flowering tree on the side of the Healing Garden opposite the Fountain Garden is called a chaste tree (Vitex agnus-castus)?  This aromatic shrubby tree can also be seen blooming in the Flagler Garden, as well as in Richmond along Broad Street, near Short Pump, and in the Virginia Center area of Glen Allen to name a few places you might have spotted it.

Butterfly bush  has arching canes that cascade downward.

Butterfly bush has arching canes that cascade downward & opposite leaves.

Medicinally, the chaste tree has been found to help with hormonal imbalances, but its name comes from the erroneous belief that chewing its leaves would help medieval monks maintain their vows of celibacy.  Hence it has also been called monk’s pepper.

It has sometimes been mistaken for a butterfly bush (Buddleia).  This is understandable as both come in similar colors of purple, white, and pink – though the chaste tree can have an almost true blue blossom.  Both attract butterflies, bees and  hummingbirds; both bloom about the same time of the year. Both reach a similar size. The chaste tree, however, left untrimmed will grow taller, and the butterfly bush can be invasive in some areas.

A closer look reveals that the butterfly bush has arching canes that cascade downward, while the chaste tree has upward pointing flowers.  The chaste tree leaves have a palmate pattern with five to seven lance-shaped leaflets emanating from a single point, while the butterfly bush has opposite leaves.  Both are aromatic, though the butterfly bush has a sweeter smell, and the scent of the chaste tree is more like sage.  The seed capsules of the butterfly bush will split in two to release small, winged seeds.  The chaste tree, on the other hand, produces aromatic berries resembling black pepper.

Both of these shrubs are planted throughout the garden, but the two can be seen side by side in the center of Flagler to the left of the Pavilion platform.

Jonah Holland is Digital Content Manager at Lewis Ginter Botanical Garden, where she has worked for 14 years overseeing social media, the blog, and the website. She is also a mom, yogi, open water swimmer, gardener, and seeker. She's been known to go for a walk in the Garden and come back with hundreds of plant photos, completely inspired to write her next blog post.

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