what to plant under a cedar tree

2 min read 25-12-2024

Cedar trees, with their majestic presence and aromatic foliage, are a prized addition to many landscapes. However, their shallow root systems and allelopathic properties (releasing chemicals that inhibit the growth of other plants) present challenges for underplanting. This comprehensive guide will help you select and successfully plant thriving companions beneath your cedar tree.

Understanding the Challenges of Planting Under Cedars

Before choosing plants, it's crucial to understand the specific limitations imposed by cedar trees.

Shallow Roots & Competition for Resources

Cedar trees have a shallow, wide-spreading root system. This means they compete aggressively for water and nutrients near the surface. Plants you choose must tolerate these conditions.

Allelopathy: The Chemical Warfare

Cedars release chemicals into the soil that can inhibit the growth of certain plants. This allelopathic effect means some species simply won't thrive beneath them.

Shade & Soil Conditions

The density of cedar trees can create shade, and the soil beneath them tends to be dry and acidic. These factors further restrict plant choices.

Selecting the Right Plants for Underplanting Cedar Trees

Choosing the right plants is key to success. Prioritize species known for their tolerance of drought, shade, acidic soil, and allelopathic conditions.

Drought-Tolerant & Shade-Loving Groundcovers

These are ideal for suppressing weeds and creating a visually appealing groundcover.

Wild Ginger ( Asarum canadense): Tolerates shade and dry conditions. Spreads slowly.
Bugleweed (Ajuga reptans): Attractive foliage in various colors; tolerates shade and drought. A fast spreader, so choose carefully.
Creeping Phlox (Phlox subulata): Low-growing, colorful blooms in spring; prefers well-drained soil but tolerates some dry conditions.
Pachysandra (Pachysandra terminalis): Evergreen groundcover offering good weed suppression; tolerates shade and drought.

Shade-Tolerant Perennials

These add height and visual interest.

Hostas (Hosta spp.): Wide variety of sizes, colors, and textures; thrives in shade and moist but well-drained soil. Consider varieties known for their drought tolerance.
Astilbe (Astilbe spp.): Attractive feathery plumes; prefers partial shade and moist soil. Can tolerate drier conditions once established.
Foamflower (Tiarella cordifolia): Delicate blooms; prefers shade and moist soil.

Other Suitable Plants

Ferns: Many fern species thrive in shady, moist conditions. However, they may not do well in extremely dry soil.
Epimedium (Barrenwort): Hardy, low-maintenance plants; tolerate dry shade.
Heuchera (Coral Bells): Offers colorful foliage and drought tolerance; prefers partial to full shade.

Planting and Maintenance Tips for Success

Even with the right plant choices, proper planting and maintenance are crucial.

Amend the Soil: Before planting, improve soil drainage and fertility by adding compost or other organic matter.
Mulching: Use a 2-3 inch layer of mulch (such as pine bark) to retain moisture, suppress weeds, and regulate soil temperature.
Watering: Water deeply but infrequently, especially during dry spells. Avoid overwatering, which can harm the plants and encourage root rot.
Monitor Growth: Regularly check plants for signs of stress or disease. Adjust watering or fertilization as needed.

Plants to Avoid Under Cedar Trees

Avoid planting anything that needs full sun, consistently moist soil, or is particularly sensitive to acidic conditions. This includes many annuals, vegetables, and plants from drier climates.

Conclusion: Co-existing Harmoniously

Planting under a cedar tree requires careful consideration, but with the right plant choices and care, you can create a thriving and beautiful understory. Remember to choose plants that tolerate the specific conditions beneath your cedar tree and provide the necessary care to ensure their success. By following these tips, you can enjoy a lush and vibrant landscape that complements the beauty of your majestic cedar.