Pelargonium graveolens: complete guide

Overview

Pelargonium graveolens, known as rose-scented geranium, is a delightful plant native to South Africa. The name tells the story: this geranium releases a charming, soft rose fragrance whenever you brush the leaves. For many gardeners, this is the ultimate scent discovery providing pleasure all season long.

The plant grows compactly and vigorously, typically reaching 60-90 cm tall. It's perfect for patio pots, balcony planters, and even warmer garden corners. In southern climates it may overwinter outdoors; elsewhere it's a seasonal treasure.

Appearance and flowering

The plant forms a full, bushy shape with numerous thick, leafy stems. The leaves are characteristic: deeply lobed, almost hand-shaped, and covered in fine hairs that produce the rose fragrance. The foliage is evergreen and remains attractive through much of the year.

The flowers are relatively modest in size but numerous and delicate - small, soft pink to white with red markings. They grow in clusters from the leaf axils and bloom continuously from May through October if you deadhead regularly. It's a subtle, elegant flowering display.

Ideal location

Rose geranium demands plenty of light and warmth. Position it in full sun, ideally against a south or west-facing wall. The plant flowers much more abundantly with abundant light. On a sunny patio or balcony without shade it thrives beautifully. Wind protection is beneficial.

The plant tolerates no shade. Even lightly shaded locations (such as half-day sun) produce sparse growth and few flowers.

Soil

Universal potting compost works well. The plant is not fussy. Mix the potting compost with approximately 20 percent sand or perlite for better drainage. Good drainage is essential - plant roots dislike prolonged wetness.

The pH can be neutral to slightly acidic (6.5-7.5). Organic matter is helpful but not essential.

Watering

Rose geranium is fairly tolerant of dryness. Water moderately during the growing season - allow the top layer of compost to dry between waterings. Excessive water is harmful, especially in potting compost.

In potting compost during summer, check soil moisture and water only when the top layer feels dry (roughly 2-3 times weekly in hot weather). In winter, outdoors in southern climates or indoors, water much less.

Pruning

Rose geranium responds wonderfully to pruning. Pinch young shoots in spring (April-May) so the plant becomes more compact and fuller. Remove spent flowers to encourage continued blooming. You can prune until mid-August, not afterwards - you want the plant to prepare for dormancy.

At the end of winter (March), before growth really starts, you can prune the plant hard back to a third of its size. This produces a more compact plant.

Maintenance calendar

January-March: Winter care. Limited watering. Hard pruning possible if needed.

April-May: Growth period. Regular pinching for compactness. Water cautiously.

June-September: Full growth and flowering. Regular watering and feeding every two weeks. Deadhead regularly.

October-November: Flowering finishes. Gradually reduce watering. Stop pruning.

December: Winter rest. Minimal watering.

Winter hardiness

Rose geranium isn't winter-hardy outdoors in the UK. Only in southern France and warmer regions can it overwinter outside in sheltered spots. The plant cannot tolerate frost below -2 to -3 degrees Celsius.

Overwintering indoors or in a light, dry greenhouse is necessary. Provide temperatures around 5-10 degrees Celsius and very limited watering. High humidity leads to mould and disease.

Companion plants

Rose geranium looks lovely grouped with other scented and architectural plants. Try it alongside lavender, rosemary, salvias, petunias and surfinia. Or plant clusters of rose geranium alone in large patio pots.

In balcony boxes it works beautifully with other pelargonium types (zonal geraniums), pale foliage plants like senecio or silvery columbines, and trailing plants such as bacopa.

Closing thoughts

Pelargonium graveolens is a hugely popular patio plant for good reason. The combination of lovely flowers, interesting leaf shape, pleasant fragrance and long flowering season makes it indispensable for balconies and patios. Grow it in full sun with well-draining potting compost. You'll find potted plants at most garden centres.

Impressed by this plant? Then you'll definitely discover more scented treasures to experiment with.