Erucastrum supinum: complete guide

Overview

Erucastrum supinum, known as Prostrate rocket or Dwarf rocket, is a fascinating low-growing plant from the Brassicaceae family. Native to the Baltic region through France, this plant grows preferentially in limy soils and is perfect for wildflower gardens and natural garden settings. With small, delicate white flowers and a spreading growth habit, it is a subtle yet attractive addition to any garden. The plant is popular in European alpine and wildflower combinations.

Appearance & Bloom

Prostrate rocket is a low, spreading plant typically reaching 10-20 centimeters with lateral spread. The plant produces small white flowers from June through August in warm seasons. Flowers are small but prolific, arranged in compact clusters with subtle beauty. Foliage is small, mostly undivided or slightly lobed, dark green in color. The plant displays an elegant spreading growth form that covers ground effectively.

Ideal Location

This plant thrives in full sun to light partial shade, though full sun is ideal for vigor. The plant requires at least 6-8 hours of direct sunlight daily for optimal growth and flowering. In deep shade, the plant grows less compactly and blooming diminishes. Situate on warm locations where sun intensity is maximized throughout the day.

Soil

Prostrate rocket grows preferentially in limy, well-draining soil. The plant prefers soils with pH 6.5 to 7, which is neutral to slightly alkaline. The plant grows well in rocky or sandy soils typical of limestone areas. This plant is quite flexible and can grow in diverse soils as long as they drain well. Calcareous substrate promotes best growth.

Watering

Once established, Prostrate rocket is drought-tolerant and endures long dry periods excellently. Water only until the plant becomes established during its first growing season. Thereafter, minimal watering is needed, as the plant tolerates dryness outstandingly. Excessive water can lead to rotting or weak growth. In dry summers, you may water, but it is not essential for health.

Pruning

Prostrate rocket requires minimal pruning and grows naturally compact. The plant grows naturally compact without any pruning needed. You can deadhead flowers to extend blooming throughout the season. Remove dead material after winter for neat appearance. Minimal maintenance is required.

Maintenance Calendar

• Spring (March-May): Growing season and bloom preparation. Minimal watering for establishment. Remove dead foliage. Evaluate growth patterns.
• Summer (June-August): Flowering period peaks. Very drought-tolerant. Deadhead flowers to extend blooming season.
• Fall (September-October): Seed development. Allow seeds to ripen on plant for natural dispersal and spreading.
• Winter (November-February): No maintenance required. Hardy plant. Monitor for exceptional frost damage and losses.

Winter Hardiness

Prostrate rocket is hardy to approximately -10 degrees Celsius in well-drained soils. The plant is quite winter-hardy and can withstand severe weather and extreme cold outstandingly well. In very cold regions, protective mulch may help during extremes. Seeds can overwinter for self-seeding next year.

Companion Plants

Prostrate rocket pairs well with other low-growing ground plants such as flax, campanula, and other alpine plants. Combine with drought-tolerant plants for dry borders and xeriscape design. Add stone chipping for textural contrast and visual interest. Thymus and sedum form natural plant partnerships.

Closing

Prostrate rocket is a fascinating and low-maintenance plant with delicate white flowers and low growth habit. With good drainage and full sun, this plant will flourish year after year with minimal care. Explore more alpine and drought-tolerant plants at gardenworld.app/en and gardenworld.app/en/plants.