Gillette's Habitat GardenField notes / Article
What the 2026 Season Taught Me About Native Plants on Columbus Clay
Compost-amended clay made prairie plants flop, bloom ran two weeks early, and wetland codes did not predict water needs. Lessons from a Columbus, Ohio habitat garden.
The 2026 season's biggest lesson: compost-amended clay is too rich for lean-soil prairie plants, and bloom here runs about two weeks early. Observed dates now beat published ranges for planning.
Soil and placement
- Rich soil makes prairie plants flop. Prairie dropseed, black-eyed Susan 'Goldsturm', blue sage and 'Purple Dome' New England aster all lodged in Bed 1. The same prairie dropseed stands upright in leaner Bed 2. My rule now: no compost for prairie and savanna species anywhere. Bed 1 is mulch only.
- Trust the proven envelope. A plant already thriving in similar conditions nearby is a better siting guide than a database code.
- Wetland codes separate three cases: a real NWPL code, no code because the plant is a hybrid or non-native, and a native that is simply absent from the Midwest list. The codes describe where a plant occurs in the wild, not how much water it needs. Black-eyed Susan 'Goldsturm' (Rudbeckia fulgida var. sullivantii) is OBL yet thrives in dry Bed 1, and scarlet bee balm (Monarda didyma) is UPL yet wants steady moisture.
- Bed 8 is a gradient. The wet band hugs the fence. The body is dry. Winged monkeyflower (Mimulus alatus) died where cardinal flower (Lobelia cardinalis) lives, which marks the wet limit.
- Eave strips stay dry into late winter, not just summer, because the hose can't run in freezing weather.
Timing
- Most bloom runs about two weeks ahead of published Ohio ranges. This lot is an urban heat sink.
- The exceptions run late. Royal catchfly (Silene regia) first bloomed August 16 (published June to August), and blue sage (Salvia azurea) was still in bud August 29.
- The first goldenrod opened August 18 (Ohio goldenrod, Solidago ohioensis), early even for this site.
Cultivars and care
| Plant | Finding |
|---|---|
| Garden phlox (Phlox paniculata) | 'Laura' outlasts 'Jeana' and reblooms after cutback. 'Jeana' ends before September with no rebloom. 'Early Blush Pop' is the compact pick. |
| Purple coneflower (Echinacea purpurea) | 'Powwow Wild Berry' and 'Prairie Splendor' rebloomed well in 2026. 'Pica Bella', 'Magnus' and the straight species underperformed. |
| Catmint (Nepeta, non-native) | A hard shear after the first flush brought an August rebloom ('Walker's Low', Bed 1). Deadheading alone left 'Cat's Pajamas' scraggly (Bed 2). |
| New England aster 'Purple Dome' | Grows about 3 ft wide and tall here, not the 18-24 in on the tag. |
| August lily (Hosta plantaginea, non-native) | A night-fragrant nectar plant that bumble bees worked in daylight, bridging the late-August gap. |
| Ornamental onion 'Millennium' (Allium) | One bloom per year; no rebloom. |
Failures worth remembering
- Spring beauty (Claytonia virginica) failed twice. Corms never came up in Bed 8 (likely too wet in summer), and plants collapsed in Bed 9 (likely the dry spring). Dried-out corm stock is the usual cause, so I'll figure out which it was before retrying.
- Joe-Pye weed (Eutrochium purpureum) failed in Bed 8's dry body before I understood the moisture gradient.
Permanently off the list
Turtlehead (Chelone glabra, by choice), black cohosh (Actaea racemosa), and gray dogwood (Cornus racemosa) for Bed 8. Gray dogwood belongs at the Bed 9 and Bed 11 edge.