Designing a 75-ft Morning-Sun Perennial Border: Fabric, Plants, Rocks & Mulch Math

A rural Connecticut rental property needs a low-maintenance, 75×6–7 ft perennial border with morning sun. Here's the complete plan.

Weed Barrier: Fabric or Plastic?

• Not essential. Makes weeds easier to pull, but rhizomatous spreaders (mint, bamboo) hate it.
• If used: Cut "X" flaps at planting holes—peel back like banana skin. No need for oversized holes unless plant is a aggressive spreader.

Soil Prep

• Test soil ($30 via UConn Extension) before amending blindly.
• Kill existing weeds: glyphosate, wait, repeat. Solarize with black plastic for tough weeds.
• Add compost only to planting holes—saves money, targets roots.

Plant Palette for Morning Sun (Zone 5b/6a)

• Woody backbone: Dogwood, Alpine Currant, Rhododendron, Coralberry, Yew (shade-tolerant).
• Perennials: See White Flower Farm (Litchfield, CT), P. Allen Smith (Wallingford, CT), Rice Creek Gardens (MN).
• Deer resistance: Critical in rural CT. Check UConn Extension list.

Rocks & Grasses

• Rocks: Excellent—break visual monotony, zero water.
• Tall grasses (Miscanthus, Calamagrostis): Yes, but cut back annually in March (maintenance).

Mulch Calculation

4" depth (0.33 ft): 75' × 6.5' × 0.33' = 161 cu ft ÷ 27 = 6 cubic yards. Round up for settling. Each 1" depth change = ±1.4 cu yds.

Resources

UConn: New Garden Bed Prep

Phase it: house-front first. Enjoy the process.