North America Non-native Plant

Tall Skullcap

Botanical name: Scutellaria altissima

USDA symbol: SCAL4

Life cycle: perennial

Habit: forb

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

Tall Skullcap: A Mysterious Member of the Mint Family If you’ve stumbled across the name tall skullcap (Scutellaria altissima) in your gardening research, you’re not alone in finding limited information about this elusive plant. This perennial forb belongs to the mint family, but unlike its more famous cousins, it remains ...

Tall Skullcap: A Mysterious Member of the Mint Family

If you’ve stumbled across the name tall skullcap (Scutellaria altissima) in your gardening research, you’re not alone in finding limited information about this elusive plant. This perennial forb belongs to the mint family, but unlike its more famous cousins, it remains something of a botanical mystery.

What We Know About Tall Skullcap

Scutellaria altissima is classified as a forb, which simply means it’s a non-woody plant that dies back to the ground each winter and returns the following spring. Like other members of the skullcap genus, it likely produces small, helmet-shaped flowers that give the group its distinctive common name.

Where You’ll Find It

This species has been documented in Massachusetts, though its exact distribution may be broader than current records suggest. As a non-native plant that has established itself in the wild, it represents one of many introduced species that have found a home in North American landscapes.

The Garden Perspective

Here’s where things get interesting – or frustrating, depending on how you look at it. Information about tall skullcap’s garden performance, appearance, and care requirements is surprisingly scarce. This could mean several things:

  • It may be a rarely cultivated species
  • It might be confused with other, more common skullcap species
  • Its garden value may be limited compared to its relatives

Consider Native Alternatives

Given the limited information available about Scutellaria altissima and its non-native status, you might want to consider native skullcap species instead. North America is home to numerous native Scutellaria species that offer proven garden performance and ecological benefits:

  • Mad-dog skullcap (Scutellaria lateriflora)
  • Hyssop skullcap (Scutellaria integrifolia)
  • Small skullcap (Scutellaria parvula)

These native alternatives typically offer better-documented growing requirements, proven wildlife benefits, and support for local pollinators and other beneficial insects.

The Bottom Line

While tall skullcap isn’t flagged as invasive or problematic, the lack of available information makes it a risky choice for gardeners seeking reliable, well-documented plants. If you’re drawn to the skullcap family, you’ll likely have better success with native species that come with established growing guides, known wildlife benefits, and support from local gardening communities.

Sometimes in gardening, as in life, the mysterious option isn’t always the best option – especially when there are so many wonderful, well-understood native alternatives waiting to thrive in your landscape.

Tall Skullcap

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

Lamiaceae Martinov - Mint family

Genus

Scutellaria L. - skullcap

Species

Scutellaria altissima L. - tall skullcap

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