North America Non-native Plant

Lilac Chastetree

Botanical name: Vitex agnuscastus var. caerulea

USDA symbol: VIAGC

Life cycle: perennial

Habit: shrub

Native status: Non-native, reproduces and persists in the wild in the lower 48 states  

Lilac Chastetree: A Mediterranean Beauty for Your Garden If you’re looking for a unique flowering shrub to add some Mediterranean flair to your landscape, you might want to consider the lilac chastetree (Vitex agnuscastus var. caerulea). This perennial woody plant brings an interesting twist to traditional garden design, though there ...

Lilac Chastetree: A Mediterranean Beauty for Your Garden

If you’re looking for a unique flowering shrub to add some Mediterranean flair to your landscape, you might want to consider the lilac chastetree (Vitex agnuscastus var. caerulea). This perennial woody plant brings an interesting twist to traditional garden design, though there are some important considerations before adding it to your space.

What Exactly is a Lilac Chastetree?

The lilac chastetree is a multi-stemmed shrub that typically stays under 13-16 feet in height, making it a manageable size for most home gardens. As a perennial, it will return year after year, developing its characteristic woody structure over time. While it can occasionally grow taller or develop a single stem under certain environmental conditions, it usually maintains that classic shrub form with several stems emerging from near ground level.

Where Does It Grow?

Here’s where things get interesting – this isn’t actually a native plant to North America. The lilac chastetree has been introduced from its Mediterranean origins and has established itself in the wild in Kentucky and Texas, where it now reproduces without human assistance.

Should You Plant It in Your Garden?

Since this plant isn’t native to North America, you might want to consider some alternatives first. Native plants are always the best choice for supporting local wildlife and maintaining ecological balance. However, if you’re drawn to the lilac chastetree’s unique characteristics and it’s not causing problems in your area, it can still make an interesting addition to your landscape.

Before planting, consider these factors:

  • It’s established itself in the wild in some areas, showing it can be quite adaptable
  • As a non-native species, it may not provide the same wildlife benefits as native alternatives
  • Its Mediterranean origins suggest it might prefer drier conditions once established

Native Alternatives to Consider

If you’re looking for native shrubs that can provide similar garden interest, consider researching native species in your region that offer comparable size and structure. Your local native plant society or extension office can provide excellent recommendations for plants that will thrive in your specific area while supporting local ecosystems.

Growing Conditions and Care

Unfortunately, specific growing information for this particular variety is limited in available resources. However, given its Mediterranean heritage and its ability to establish itself in Kentucky and Texas, it likely prefers:

  • Well-draining soil
  • Full sun to partial shade
  • Moderate water once established
  • Protection from extreme cold in northern regions

The Bottom Line

While the lilac chastetree can be an interesting addition to certain landscapes, remember that choosing native plants is always the most environmentally responsible option. If you do decide to grow this Mediterranean transplant, make sure you’re sourcing it responsibly and keeping an eye on how it performs in your garden. When in doubt, consult with local gardening experts who know your specific region’s needs and can recommend the best plants for your unique growing conditions.

Happy gardening, and remember – the best garden is one that works harmoniously with your local environment!

Lilac Chastetree

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Lamiales

Family

Verbenaceae J. St.-Hil. - Verbena family

Genus

Vitex L. - chastetree

Species

Vitex agnus-castus L. - lilac chastetree

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA