Asystasia 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 10 through 13 and grows just as well in a container as in the ground. Its flowers are a moderate draw for honeybees, native bees, and butterflies.
Zones
10-13
pH Range
3.5-5
Sun
Part Sun
Days to Maturity
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Score Asystasia on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether asystasia actually takes — and those shift from one yard to the next. Enter your address and we'll score asystasia against your land's real conditions.
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What Asystasia is
It's also well suited to containers.
How to grow Asystasia
Asystasia grows in USDA zones 10 through 13. Asystasia does best in part sun — at least 4 hours of direct sun a day — and soil from pH 3.5 to 5, on evenly moist to well-drained ground. It needs a growing season of at least 42 frost-free days, which is why climate matters as much as soil.
USDA Zones
10-13
USDA PHZM 2023
Soil pH
3.5 - 5
USDA PLANTS Database
Sun
Part Sun
plant_species_v5.csv
Drainage
poorly (saturated >50% of year), well (dry spells)
plant_species_v5.csv
Frost Tolerance
46.4°F
plant_species_v5.csv
Frost-Free Days
42+
plant_species_v5.csv
Start the season right
Plant asystasia in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Asystasia prefers pH 3.5 to 5 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Turn it in before it seeds
Cut asystasia 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.
Good to know
Good news for pet owners — asystasia isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Asystasia offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Asystasia thrives
Asystasia is hardy across USDA zones 10 through 13. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 10–13·Where Asystasia growsOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
On USDA hardiness-zone overlap, Asystasia can grow in these states:
See if Asystasia will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether asystasia actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Asystasia in my zone?
Asystasia grows in USDA hardiness zones 10 through 13 (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 Asystasia?
Most growers plant asystasia after the last spring frost, once the soil has warmed, leaving enough of the season for its 42-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Asystasia need?
Asystasia 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 Asystasia need?
Asystasia prefers soil pH 3.5 to 5, on evenly moist to well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Asystasia attract pollinators?
Yes — asystasia's flowers are a solid nectar source for honeybees, native bees, and butterflies (Xerces Society, Pollinator Partnership).
Is Asystasia safe for pets?
Asystasia is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.