4 English Cottage Garden Ideas for Evansville, IN | Ohio River Zone 6b

The brick Italianates and Queen Annes of the Riverside Historic District, the big porches along Washington Avenue, the bungalows and foursquares around Bayard Park and the Tudor Revivals of Lincolnshire all sit close to the sidewalk on modest lots, which is where a cottage border looks best. Red brick, a painted porch and a short front walk give the planting a frame, and a 30-foot setback filled with roses, catmint and phlox looks deliberate in a way the same plants never manage across a big suburban lawn.

Summer heat limits the plant list more than winter cold does. NOAA's 1991–2020 normals for Evansville Regional Airport put the January average low at 25.5°F and the typical coldest night of the year near 2°F, so Zone 6b winters are easy on the classic plant list. Summer is harder: a July average high of 88.6°F, about 41 days a year at 90°F or more, Ohio River humidity and roughly 48 inches of precipitation a year. Delphinium elatum melts by July and Lavandula angustifolia 'Hidcote' usually rots out in a wet, heavy bed, so the picture is carried by plants that take the heat: Lavandula × intermedia 'Phenomenal', Nepeta × faassenii 'Walker's Low', Salvia nemorosa 'Caradonna' (the stand-in for delphinium spires), mildew-resistant Phlox paniculata 'Jeana' and disease-tolerant roses such as Rosa 'New Dawn' and Rosa 'Olivia Rose Austin'. The average last freeze is April 7 and the first is October 26, a frost-free season of about 201 days.

Soil decides how you build the beds. The uplands across the north and east side are wind-blown loess silt loam, and much of it carries a dense fragipan a couple of feet down that holds winter water like a bathtub; the older neighborhoods near the river sit on Ohio River bottomland silt and a century of fill. Both tend toward acidic, often around pH 5.5–6.5, which suits Hydrangea arborescens 'Annabelle' but is a touch sour for lavender and roses. Get a soil test, lime the lavender and rose beds toward pH 6.5–7.0 and raise every border 6–10 inches so crowns never sit in February water.

Older Evansville drains to combined sewers, and the Evansville Water and Sewer Utility is in the middle of long-running sewer overflow work, so anything that keeps rain on your lot (a brick walk laid on sand, a gravel sitting circle, a rain garden at the downspout) helps the river as well as the roses. If your house is in a locally designated historic area such as Riverside, check with the city before you build a fence, wall or arbour that faces the street.