North America Non-native Plant

Forskohlii

Botanical name: Plectranthus barbatus

USDA symbol: PLBA2

Native status: Not native but doesn't reproduce and persist in the wild

Forskohlii: The Colorful Herb That’s More Than Meets the Eye Ever heard of forskohlii? This delightful plant might not roll off the tongue easily, but Plectranthus barbatus deserves a spot on every gardener’s radar. Whether you’re drawn to its stunning purple-blue flower spikes or intrigued by its rich medicinal history, ...

Forskohlii: The Colorful Herb That’s More Than Meets the Eye

Ever heard of forskohlii? This delightful plant might not roll off the tongue easily, but Plectranthus barbatus deserves a spot on every gardener’s radar. Whether you’re drawn to its stunning purple-blue flower spikes or intrigued by its rich medicinal history, this aromatic beauty brings both charm and purpose to the garden.

What Exactly is Forskohlii?

Forskohlii is a member of the mint family that hails from the highlands of Eastern Africa, particularly Ethiopia and Kenya. While it’s not native to North America, this hardy perennial has found its way into gardens worldwide thanks to its striking appearance and easy-going nature.

In its native habitat, forskohlii thrives in mountainous regions where it has adapted to survive with minimal water and plenty of sunshine. This resilient background makes it an excellent choice for gardeners looking to create water-wise landscapes.

Why Gardeners Love (and Sometimes Question) Forskohlii

Here’s the thing about forskohlii – it’s got personality! The plant produces gorgeous spikes of tubular purple-blue flowers that seem to dance above aromatic, heart-shaped leaves. But since it’s not native to our continent, some gardeners wonder if they should choose local alternatives instead.

The good news? Forskohlii isn’t invasive or harmful to local ecosystems. However, if you’re committed to purely native gardening, consider these beautiful North American alternatives:

  • Wild bergamot (Monarda fistulosa) for similar aromatic qualities
  • Anise hyssop (Agastache foeniculum) for purple flower spikes
  • Native salvias for drought tolerance and pollinator appeal

Garden Design Magic with Forskohlii

This versatile plant shines in several garden settings. Its upright growth habit and colorful blooms make it perfect for:

  • Herb gardens where form meets function
  • Mediterranean-style landscapes
  • Container gardens on patios or decks
  • Pollinator gardens (bees and butterflies adore it!)
  • Drought-tolerant garden beds

Forskohlii typically reaches 2-4 feet in height with a similar spread, making it an ideal mid-border plant that won’t overwhelm smaller companions.

Growing Forskohlii: Easier Than You Think

Ready to give forskohlii a try? Here’s what this easygoing plant needs to thrive:

Perfect Growing Conditions

  • Sunlight: Full sun to partial shade (6+ hours of direct sun preferred)
  • Soil: Well-draining soil is crucial – soggy roots spell disaster
  • Water: Drought tolerant once established, but appreciates occasional deep watering
  • Climate: Hardy in USDA zones 9-11; treat as an annual in cooler areas

Planting and Care Tips

Getting started with forskohlii is refreshingly simple:

  • Plant after the last frost when soil has warmed
  • Space plants 18-24 inches apart for good air circulation
  • Water regularly during the first month, then reduce frequency
  • Deadhead spent flowers to encourage continued blooming
  • In colder zones, take cuttings in late summer to overwinter indoors

The Pollinator Party Plant

One of forskohlii’s greatest gifts is its ability to attract beneficial insects. Those tubular flowers are like little landing strips for bees, butterflies, and other pollinators. Plant it near your vegetable garden, and you’ll likely see increased pollination activity – a win-win situation!

The Bottom Line on Forskohlii

While forskohlii isn’t a native North American plant, it’s also not a troublemaker in our gardens. If you’re drawn to its beauty and easy care requirements, there’s no harm in giving it a try. Just remember to balance non-native additions with plenty of native plants that support local wildlife year-round.

Whether you call it forskohlii or simply that pretty purple plant, Plectranthus barbatus offers gardeners a delightful combination of beauty, fragrance, and pollinator appeal. In a world where gardening success sometimes feels elusive, this forgiving plant might just become your new favorite garden companion.

Forskohlii

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

Plectranthus L'Hér. - plectranthus

Species

Plectranthus barbatus Andrews - forskohlii

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