Di Madgin's Heritage Garden is a garden at 373 River Road, Dallington, Christchurch, rated 3.7 from 3 Google reviews. The directory copy says the garden was created by Bill Wilmott and Di Madgin, and that it was kept up after the house and land were red zoned following the 2011 earthquake.
A heritage garden on former residential land is judged on its planting, its paths and how well its history is explained on site. Gardens kept up by former owners or volunteers often have strong planting but limited facilities, so check the paths and seating before a longer visit. Signage is worth reading, since it can explain the garden's past. Regulars often return to see how the plants change through the seasons.
For a look at a garden kept up after the red zoning in Dallington, this heritage garden is worth a visit.