Species Lyall's Rockcress
light-purple flowers with yellow and light-purple buds with red-yellow sepals and green leaves on red stems

Lyall's Rockcress

Boechera lyallii

Lyall's Rockcress (Boechera lyallii) is a striking perennial herb native to the Rocky Mountains in western North America. It grows in rocky or sandy places, often high in the mountains, and is related to the larger and closely related Arabis species. Its deep green, pinnately lobed leaves form in a basal rosette, while its tall inflorescences are composed of loose white or pale pink flowers in the spring. Although not common in gardens, it is a valuable addition to a rocky garden, and is a great choice for dry, exposed locations. Its height and wispy foliage add texture and drama to any landscape.

Watering:

Minimal

Propagation:

Seed Propagation,Cutting,Division,Layering Propagation

Hardiness Zone:

Sun:

full sun,part shade

Leaf:

Yes

Leaf Color:

green

Growth Rate:

Low

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Care Level:

Medium

watering

Watering frequency and amount should depend on the environment in which Lyall's Rockcress is growing. If planted in porous soil in full sun, water the plant deeply at least once a week, allowing the top 2 inches of soil to dry out in-between watering. In hot, dry climates, the plant may need to be watered more frequently to prevent wilting. If planted in clay-dominant soil or shady conditions, water less frequently, only when the top 2-inches of soil is completely dry. Always avoid over-watering, which can lead to root rot.

sunlight

Lyall's Rockcress thrives in full sun or partial shade. It performs best in areas that receive at least 6 hours of direct sunlight every day. In the summer months, the plant may need additional shade if temperatures become too hot or if it is in an especially sunny location. From late spring to mid-autumn, Lyall's Rockcress should receive the maximum amount of sun available. In the winter months, the plant can tolerate up to 4 hours of direct sunlight daily or half a day’s worth of light.

pruning

Lyall's Rockcress (Boechera lyallii) should be lightly pruned in late summer or early fall. Pruning should be done selectively, removing recent shoots that are growing too close to 1 another or pruning leggy, woody stems which will encourage more compact and dense growth. Punctual pruning of flower stems will also promote more prolific production of flowers in the next season.