How to Grow Ornamental Kale

Ornamental Kale — the short answer

How to grow Ornamental Kale

Ornamental Kale grows in USDA zones 2 through 10. Ornamental Kale does best in part sun — at least 4 hours of direct sun a day — and soil from pH 5.5 to 8.5, on well-drained ground. It needs around 500 growing degree days to mature, which is why climate matters as much as soil.

1. 1

   Start the season right

   Plant ornamental kale in part sun with at least 4 hours of direct sun. It grows in the cool halves of the year, so sow it in spring or late summer rather than waiting for midsummer heat. We haven't confirmed this against a published source yet.

2. 2

   Match the soil

   Ornamental Kale prefers pH 5.5 to 8.5. We haven't confirmed this against a published source yet. A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.

3. 3

   Water steadily

   Keep the root zone evenly moist through establishment. We haven't confirmed this against a published source yet. A 2–3 inch mulch layer holds moisture without waterlogging.

4. 4

   Harvest at its peak

   Cut ornamental kale blooms in the cool of the morning, just as they open, for the longest display.

Where Ornamental Kale thrives

On hardiness alone, ornamental kale grows across most of the country — its range (USDA zones 2 through 10) is unusually wide. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.

A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 2–10 spans average winter lows from -50°F to 40°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 47 outright and splits 4 more down the middle — and which side of that line your land sits on changes the answer.

Zones 2–10·Where Ornamental Kale growsOpen map →

Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.

This map is derived from the USDA ARS / PRISM Plant Hardiness Zone Map (2023) and is not the official USDA Plant Hardiness Zone Map.

Where Ornamental Kale stands, state by state

What grows around Ornamental Kale

Your land is one point inside Ornamental Kale's range

This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.

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See if Ornamental Kale will thrive on your land

Zone averages are a start. Your soil pH, drainage, sun exposure, and frost dates shape whether ornamental kale actually takes. We score it against the mapped and modelled conditions at your address.

Three things about your exact spot that zone averages miss:

Your soil pHYour frost-free daysYour sun & shade

We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.

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How we know this about Ornamental Kale

The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.

Grounded inUSDA PLANTS Database