Round-leaved restharrow: complete guide

Overview

The Round-leaved Restharrow, scientifically known as Ononis rotundifolia, is a compact alpine plant native to the mountains of southern Europe. This species is recognized for its deep purple flowers and adapted growth habit, making it perfect for alpine gardens and rocky sites. In the wild, this plant grows on mountain meadows and rocky slopes at elevations between 800 and 2500 meters.

Appearance and bloom

The Round-leaved Restharrow grows to approximately 30 to 50 centimeters, forming compact, upright bushy shrubs. The leaves are rounded to oval, dark green, and hairy, giving it interesting texture. From May to August, the plant produces numerous deep purple to pink flowers appearing in small clusters along the stems. The flowers are papilionaceous with distinctive form. After flowering, small seed pods develop.

Ideal location

The Round-leaved Restharrow thrives in full sun with at least 6 to 8 hours of direct sunlight daily. Plant in alpine gardens, rock gardens, or border fronts where good drainage is essential. Protection from intense midday sun in very hot climates can prevent scorching. Preference for higher locations with good air circulation.

Soil

This plant requires well-drained, not overly fertile soil with a pH between 6.5 and 8.0. Loose, stony soils are ideal as naturally found in alpine regions. The Round-leaved Restharrow tolerates dry conditions well once established. Preference for nutrient-poor soils offers better flowering than very fertile soils.

Watering

Once established, the Round-leaved Restharrow is very drought tolerant. During the first season, keep moderately moist until a deep root system becomes established. In established plants, regular watering is not needed except during extreme drought conditions. Over-watering must be absolutely avoided.

Pruning

Minimal pruning is needed. In late winter, dead branches and faded flowers can be gently removed. The plant can be lightly trimmed after flowering to promote more compact growth. Very heavy pruning must be avoided as it can disrupt the plant's overall shape.

Maintenance calendar

March-April: Inspect plant for winter damage; no feeding needed. May-July: Keep moderately moist during blooming. August: Minimize feeding after blooming. September-October: Prepare for winter with slight water reduction. November-February: Rest period with minimal care.

Winter hardiness

The Round-leaved Restharrow is hardy to -20C and blooms in zones 5-8. This is a very hardy plant resistant to severe mountain winters. No special winter protection needed in most climates. In extremely wet winters, drainage system inspection may be necessary.

Companion plants

The Round-leaved Restharrow combines well with other alpine plants such as thyme, stonecrop, and alpine asters. Associate with small growing conifers and rocks for structure. Also suitable for garden rockeries with other mountain plants. In pots, combine with other succulents.

Closing remarks

The Round-leaved Restharrow is a robust, reliable alpine plant that can provide years of enjoyment. With minimal maintenance and correct drainage, this plant grows successfully in various climates. Perfect for gardeners seeking easy, reliable alpine plants. Visit gardenworld.app/nl and gardenworld.app/en for more garden inspiration.