blue star creeper (Isotoma fluviatilis), photographi

How to Grow Blue Star Creeper

Isotoma fluviatilis · Zones 6-8

Blue Star Creeper is a cover crop — grown to build and protect the soil rather than for a harvest of its own. It's hardy across USDA zones 6 through 8, shrugs off deer and grows just as well in a container as in the ground. Its summer flowers are a modest draw for native bees.

Blue Star Creeper — the short answer

Blue Star Creeper: grown in zones 6–8, part sun, pH 6.1–7.8.

USDA zones
6–8
Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
Soil pH
6.1–7.8
Growable Ground Plant Database
Sun
Part Sun
Growable Ground Plant Database

Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.

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Score Blue Star Creeper on your exact land.

Zone averages can't see the slope, soil, frost, and sun that decide whether blue star creeper actually takes — and those shift from one yard to the next. Enter your address and we'll score blue star creeper against your land's real conditions.

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What Blue Star Creeper is

Blue Star Creeper grows as a perennial and reaches around 2 inches at maturity. It blooms blue in summer. It's also deer-resistant and well suited to containers.

How to grow Blue Star Creeper

Blue Star Creeper grows in USDA zones 6 through 8. Blue Star Creeper does best in part sun — at least 4 hours of direct sun a day — and soil from pH 6.1 to 7.8, on well-drained ground. It needs a growing season of at least 120 frost-free days, which is why climate matters as much as soil.

USDA Zones

6-8

USDA PHZM 2023

Soil pH

6.1 - 7.8

Growable Ground Plant Database

Sun

Part Sun

Growable Ground plant catalog

Drainage

well (dry spells)

Growable Ground plant catalog

Mature Height

0.2 ft

Growable Ground plant catalog

Frost-Free Days

120+

The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.

Growable Ground plant catalog

  1. Start the season right

    Plant blue star creeper 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.

  2. Match the soil

    Blue Star Creeper prefers pH 6.1 to 7.8 (Growable Ground Plant Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.

  3. Water steadily

    Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.

  4. Turn it in before it seeds

    Cut blue star creeper down or turn it into the soil before it sets seed, while the growth is still green — that's when it returns the most to the ground.

Where Blue Star Creeper thrives

Blue Star Creeper is hardy across USDA zones 6 through 8. 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 68 spans average winter lows from -10°F to 20°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 9 outright and splits 39 more down the middle — and which side of that line your land sits on changes the answer.

Zones 6–8 highlighted on the USDA national hardiness zone map

Zones 6–8·Where Blue Star Creeper growsOpen map →

Where Blue Star Creeper stands, state by state

Blue Star Creeper is rated for zones 68 — a cold floor USDA puts at -10 to 0°F. Across the 50 states and DC, 9 sit fully inside that band, the line runs through 39 more, and 3 sit outside it — and inside every split state, the same line runs on at county grain.

Fully inside zones 6–8

9 states

3 of 9 shown

The line runs through

39 states

3 of 39 shown

Blue Star Creeper’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.

Outside zones 6–8

3 states

Winter cold is the limit here — the same plant often works in a container that comes under cover. Each link is that state’s own growing hub.

State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.

What grows around Blue Star Creeper

In rotation planning, blue star creeper counts as a Other — beds recover best when other crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)

Good to know

Good news for pet owners — blue star creeper isn't known to be toxic to dogs or cats. (Source: ASPCA.)

Blue Star Creeper offers low value to bees and other pollinators.

Your land is one point inside Blue Star Creeper'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.

Free Report

See if Blue Star Creeper will thrive on your land

Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether blue star creeper actually takes — we score it against the real 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 Blue Star Creeper

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 DatabaseUSDA PHZMASPCA

Frequently asked questions

Can I grow Blue Star Creeper in my zone?

Blue Star Creeper grows in USDA hardiness zones 6 through 8 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.

When should you plant Blue Star Creeper?

Blue Star Creeper is a cool-season crop, so it goes in during the cool halves of the year — early spring, and again in late summer for a fall planting — rather than at the height of summer heat. Your local frost dates set the exact window — a Growable Ground report reads them for your address.

How much sun does Blue Star Creeper need?

Blue Star Creeper does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.

What soil does Blue Star Creeper need?

Blue Star Creeper prefers soil pH 6.1 to 7.8, on well-drained ground (Growable Ground Plant Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.

Does Blue Star Creeper attract pollinators?

Yes — blue star creeper's flowers are a modest nectar source for native bees.

Is Blue Star Creeper safe for pets?

Blue Star Creeper is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)