Creating a Shade Garden Under a Deck: Plants, Design & Features

Transforming the Space Under a Deck into a Shade Garden Retreat

A homeowner in Zone 5 has an 18×54 ft area under a new deck (with a 12×12 ft concrete slab in the middle) and wants a lush shade garden with walkways, lighting, and possibly a water feature. The space is accessible from a walk-out basement used for entertaining. They love hostas and ferns, want non-toxic plants for kids, and are open to higher maintenance.

Top Shade-Loving Perennials (Non-Toxic)

• Ferns: Lady fern, Japanese painted fern, Christmas fern
• Hostas: Countless cultivars in varied sizes/colors
• Astilbe: Feathery plumes in pink, red, white
• Bleeding heart (Dicentra): Heart-shaped spring flowers
• Brunnera: Silver-marked foliage, blue spring flowers
• Heuchera (Coral bells): Colorful foliage all season
• Lady's mantle (Alchemilla): Chartreuse flowers, soft leaves
• Bugbane (Cimicifuga/Actaea): Tall, fragrant late-summer spikes
• Lily of the valley: Fragrant groundcover (can spread aggressively)

Most shade perennials are low toxicity; ingesting large amounts is typically needed for harm. Still, supervise young children and teach them not to eat plants.

Design & Planning

• Hire a landscape designer for a scaled plan—it provides a clear map for walkways, lighting zones, water feature placement, and plant groupings.
• Walkways: Use stepping stones, flagstone, or permeable pavers set in sand/gravel over fabric. Curve paths for interest.
• Lighting: Low-voltage LED path lights, uplights for specimen plants, and string lights for ambiance. Run wiring before final planting.
• Water feature: A small recirculating fountain or bubbling rock adds sound and movement. Campania International offers high-quality options.
• Soil prep: Amend existing soil heavily with compost. The concrete slab can be a focal point (seating area, container grouping) or partially removed for planting pockets.

Phasing

Start with hardscape (paths, lighting, water feature), then plant in fall or spring. Mulch with shredded leaves or bark to retain moisture and build soil.