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Vitex

Vitex agnus-castus

Other Common Names

Chaste Tree, Texas Lilac, Monk’s Pepper

Plant Category

Shrub, Tree

Invasive Description

Vitex was introduced from Southern Europe and Western Asia. Sometimes called Texas Lilac, it is neither a lilac nor from Texas. Texas lilac is a marketing name only. It is a sprawling small tree or large shrub, 10 – 20 feet high and wide. Often grown as ornamental for its attractive purple flowers. Branched flower clusters are produced on new wood in late spring and early summer in a great flush that makes the tree look like a hazy purple cloud. It continues to bloom sporadically until early fall. Not only is the tree strikingly beautiful when in full bloom, but it is also fragrant and attracts pollinating bees and hummingbirds. Flowers are followed by a fleshy fruit that contains four seeds that are sometimes used as seasoning, similar to black pepper (Monk’s Pepper is another of this species’ common names). Flower color ranges from violet to blue to deep purple.

Ecological Threat

Vitex is a very aggressive small tree or large shrub. It readily reseeds to surrounding areas, especially riparian areas, out-competing natives. It produces an abundance of seeds which can persist for years. It is widely available in nurseries.

How to Eradicate

For information on how to eradicate this invasive, view our statement on herbicide use and preferred alternatives for invasive plants.

Native Alternatives

You can replace this invasive plant with native alternatives. Here are some plants that make superior replacements.

Match your location on the Texas map to the color squares on the replacement plants below to find suitable replacements for your ecoregion.

Click for more details about the ecoregions