Pelargonium exstipulatum aka Scented Pennyroyal

Pelargonium exstipulatum is generally an easy plant to grow where conditions suit it. It requires full sun and well-drained soil but tolerates a range of moisture levels from dry to moderately moist. Propagation from cuttings is straightforward and successful during the growing season.

This species forms a compact, woody shrublet reaching approximately 1 metre (about 3 feet) in height and 50 cm (about 20 inches) in spread. Growth is characteristically upright and branched.

Pelargonium exstipulatum tolerates both dry and moist conditions, making it relatively drought-tolerant once established. Well-drained soil is important — standing water or consistently soggy conditions should be avoided. Allow the top of the soil to dry out between waterings, and reduce watering frequency in cooler months.

Grow in light (sandy) to medium (loamy), well-drained soil. The plant is tolerant of mildly acidic to mildly alkaline pH. Avoid heavy, waterlogged substrates — good drainage is essential to prevent root rot.

This species is frost tender, rated USDA hardiness zones 8–11 and UK hardiness zone 9. It will not survive hard frosts and should be brought indoors or given frost protection in cooler climates.

In climates cooler than USDA zone 8, bring plants indoors before first frost to overwinter in a bright, frost-free location. In zones 8–11, plants can remain outdoors year-round. Cuttings are best taken during the active growing season for easy rooting.

Yes — the foliage of Pelargonium exstipulatum has a sweet, slightly spicy aromatic scent often likened to pennyroyal. Crushing or brushing the leaves releases the fragrance most intensely. The plant is commonly used in potpourri for this reason, and an essential oil with a pennyroyal-type fragrance can be extracted from the plant.

Pelargonium exstipulatum produces small pink flowers. Specific bloom period data is limited in available sources, but as a South African shrublet it typically flowers in spring to early summer under cultivation.

The most notable cultivated derivative is the hybrid Pelargonium × fragrans, produced by crossing P. exstipulatum with P. odoratissimum. Multiple cultivars and varieties of this hybrid have been developed for their fragrant foliage.

Pelargonium exstipulatum is suited to outdoor cultivation in USDA zones 8–11 (UK zone 9). In these regions it can be grown as a permanent outdoor perennial shrublet in full sun with well-drained soil. In colder climates it is best grown in containers that can be moved indoors for winter.

This species propagates readily from both seed and stem cuttings. Cuttings root easily and are the most reliable method; take them during the active growing season for best results.

The crushed leaves of P. exstipulatum are edible and used to flavour jellies, cakes, and fruit dishes. Leaves and flowers of scented Pelargonium species are also used in teas, herbal butter, and vinegar. The edibility rating is low (1 out of 5) — the leaves are primarily a culinary flavouring rather than a nutritional food source.

All parts of the plant are reported to be astringent. The medicinal rating is modest (2 out of 5). No specific clinical applications for P. exstipulatum are detailed in major pharmacopeias; the astringent property is the primary noted attribute.

An essential oil with a pennyroyal-type fragrance is obtained from the plant and used in perfumery and aromatics. The aromatic foliage is also used in potpourri and sachets.

Pelargonium flowers are typically pollinated by insects. The genus is known for nectar-bearing flowers attractive to bees and other pollinators, though specific pollinator data for P. exstipulatum is not detailed in available sources.

Scented Pennyroyal’s native range is S. Africa.

Scented Pennyroyal requires abundant, bright and direct light. Placing it less than one foot from a window is the best way to make sure the plant receives enough light to survive and thrive. Depending on your region, however, the current weather can affect the placement of the plant in your home. For example, in some areas the sun may be too direct and intense, so it's best to place it farther away from the window. You may also need to adjust your placement according to the season as the sunlight can change intensity over the course of the year. If you live in a region with significant temperature fluctuations, such as a desert, you may need to place the plant a bit farther away from the window to avoid extreme heat or cold. With some care and attention, your Greyleaf Storksbill will be sure to bring you many years of beauty and enjoyment.

Scented Pennyroyal is toxic to pets if ingested. We suggest keeping this plant out of reach if you have cats or dogs in the home.