Planting Perennials in Mulch Without Soil Cover: Acceptable Practice or Root Exposure Risk?

The Short Answer

No — roots must not be left exposed. “No-till” or “lasagna gardening” places plants on soil, then covers roots with compost/mulch layers. Roots cannot sit in mulch alone — they dry out, overheat, and die.

Correct No-Till Method

1. Lay cardboard/newspaper over grass.
2. Add 6–12 inches of compost, straw, leaves.
3. Plant into this layer — roots grow down into decomposing material.
4. Mulch on top.

What Your Landscaper Did Wrong

Placing root balls on hard soil and surrounding with mulch = no soil contact, no moisture reservoir, no nutrient access. Sedum, daylily, and vinca will struggle or die.

Fix It Now

Gently lift plants, loosen root balls, plant into native soil amended with compost, water deeply, then mulch. If soil is compacted, aerate first.