Guar Bean is grown for the harvest, ready about 90 days after sowing. It's hardy across USDA zones 8 through 12 and handles dry spells once it's established. Its flowers are a modest draw for honeybees, even though the harvest is the prize. A nitrogen-fixer, it draws nitrogen from the air and feeds it back to the soil — turn it under or leave the roots in place, and the next planting inherits a richer bed.
Zones
8-12
pH Range
5.5-8.5
Sun
Full Sun
Days to Maturity
90
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What Guar Bean is
Guar Bean reaches around four feet at maturity.
How to grow Guar Bean
Guar Bean grows in USDA zones 8 through 12 and is ready to harvest about 90 days after planting. Guar Bean does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 8.5, on well-drained ground. It needs around 2,500 growing degree days to mature and a growing season of at least 90 frost-free days, which is why climate matters as much as soil.
USDA Zones
8-12
USDA PHZM 2023
Soil pH
5.5 - 8.5
USDA PLANTS Database
Sun
Full Sun
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Drainage
well (dry spells)
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Frost Tolerance
50°F
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Days to Maturity
90 days
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GDD Required
2500+
plant_species_v5.csv
Mature Height
4 ft
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Frost-Free Days
90+
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Start the season right
Plant guar bean in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Guar Bean prefers pH 5.5 to 8.5 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band. It fixes its own nitrogen, so skip the high-nitrogen feed and instead dust the seed with a matching rhizobium inoculant at sowing.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Guar Bean is ready about 90 days after sowing (University Extension production guides). Watch for cultivar-specific ripeness cues and pick at peak.
Good to know
Good news for pet owners — guar bean isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Guar Bean offers low value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Guar Bean thrives
Guar Bean is hardy across USDA zones 8 through 12. 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 8–12·Where Guar Bean growsOpen map →
On USDA hardiness-zone overlap, Guar Bean can grow in these states:
See if Guar Bean will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether guar bean actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Guar Bean in my zone?
Guar Bean grows in USDA hardiness zones 8 through 12 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Guar Bean take to grow?
Guar Bean is ready to harvest about 90 days after planting (University Extension production guides). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Guar Bean?
Most growers plant guar bean after the last spring frost, once the soil has warmed, leaving enough of the season for its 90-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 Guar Bean need?
Guar Bean needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Guar Bean need?
Guar Bean prefers soil pH 5.5 to 8.5, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Guar Bean attract pollinators?
Yes — guar bean's flowers are a modest nectar source for honeybees (Xerces Society, Pollinator Partnership).
Is Guar Bean safe for pets?
Guar Bean is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.