Reviving a Neglected Garden: Lessons from Undoing a Costly Remodel

When Luke and Petra Hoyer Millar moved to their Oxfordshire home two years ago, they fell in love with the house but turned their full attention to the garden. What they inherited was a landscape shaped by an expensive, poorly executed makeover—dry-stone walls smothered in chicken wire and ivy, a failing potager of diamond-shaped beds edged with dead box, and a tangle of overgrown shrubs. Their two-year journey of reclamation offers hard-won insights for anyone taking on a garden with a troubled past.

The Hidden Cost of Dry-Stone Walling

The property’s two main gardens are enclosed by acres of dry-stone walling—a feature that looked pristine but concealed a disaster. Previous owners had covered the walls with chicken wire to encourage ivy, which eventually destroyed the mortar, while hazel roots pushed stones apart. In the future herb garden, the wall was also choked with Clematis montana and spiky Berberis. Removing that vegetation revealed a long-suffering, large-leaved magnolia. “The cost of dry stone walling,” Luke says, “is something I wish someone had told us upfront.”

A Garden on Display Year-Round

“Part of the reason we bought the house was that from every window, you can see the garden,” says Petra, author of the Oxonion Gardener blog. “We live in the garden; we’re out here more than we’re indoors.” That constant visibility means the garden must perform in every season. Petra works hard at winter interest: grasses like Calamagrostis x acutiflora ‘Karl Foerster’ hold their structure, while thalictrums, eupatoriums, and plants that “die nicely” provide texture. The major cutback happens in March.

Working with Existing Trees

A magnificent katsura tree anchors the main lawn, turning pale orange in autumn and releasing a scent of caramel. Petra added Japanese maples to extend the color sequence. On the woodland side, they fast-tracked maturity by planting established hornbeam and hazel, creating immediate depth. Oversized trees crowding the back wall were replaced with choice specimens like Parrotia persica, and thinning beyond the wall opened views toward a neighboring ruined castle, lending a sense of borrowed landscape.

Reshaping Borders and Hardscape

An east-facing border was expanded from three feet to ten feet deep, allowing drifts of alliums (Allium christophii, A. purpurea, A. sphaerocephalon) and Sedum ‘Matrona’. A winding path of irregular pavers now threads through a formerly impassable area, passing a venerable yew underplanted with spring bulbs. Beyond the back wall, a new woodland garden incorporates existing foxgloves and snowdrops, enriched with ferns, Hydrangea arborescens ‘Annabelle’, Pulmonaria ‘Sissinghurst White’, sweet cicely, and Euphorbia characias subsp. ‘Wulfenii’.

Irrigation: From Rigid to Flexible

The previous owners installed a fixed irrigation system that prevented digging or feeding borders. Petra favors a “leaky hosepipe” approach—movable tubes laid during the growing season and stored in winter. A well by the kitchen will soon supply three new taps around the garden, including one by the future greenhouse.

Surprises and Adjustments

“It takes a lot longer than you think,” Petra admits. Black elders (Sambucus nigra) repeated throughout the borders are slow to settle. Meanwhile, Monarda ‘Raspberry Wine’ grew to six feet on the west-facing side—double its usual height—disrupting the planting plan. Prairie plants thrived in full sun despite poorer soil, proving that light often trumps soil quality.

What They Kept

A mysterious pink phlox (likely ‘Sandringham’), a California tree poppy with glaucous foliage, and the original black elder—which set the purple-pink tone of the borders—were retained. Ageratina altissima ‘Chocolate’ (formerly Eupatorium ‘Chocolate’) anchors the scheme with late-season bloom.

From Rubbish Heap to Woodland Walk

Previous owners threw garden waste over the ten-foot wall for years, creating a mound nearly to the top. Clearing it allowed new tree planting and a practical, enjoyable path around the yew to the shed. “We use every inch,” Petra says. “We appreciate every corner.”