Types of Low-Water Groundcovers to Supplement Wyoming Lawns

Wyoming landscapes demand plants that tolerate cold winters, strong sun, wind, alkaline soils, and long periods between rains. For many homeowners, converting portions of a traditional Kentucky bluegrass lawn to low-water groundcovers reduces irrigation needs, lowers maintenance, and increases ecological resilience. This article reviews practical, cold-hardy groundcover types and species to use in Wyoming, discusses siting and soil considerations, and gives concrete establishment and maintenance steps you can apply to replace or supplement lawn area successfully.

Why low-water groundcovers are a good choice in Wyoming

Wyoming presents several constraints for plant selection: low annual precipitation, wide temperature swings including deep winter cold, high elevation and UV exposure, and often alkaline, rocky soils. Traditional cool-season lawns require frequent watering and regular inputs to stay green. Low-water groundcovers offer several advantages:

Reduced irrigation once established.
Lower mowing and fertilization needs.
Better drought and heat tolerance than many turf grasses.
More habitat and seasonal interest (flowers, texture).

When selecting groundcovers for Wyoming, prioritize cold hardiness (USDA zones 3 to 5 for much of the state), drought tolerance, and tolerance of alkaline, compacted or rocky soils.

Selection criteria: what to evaluate before planting

Match species to site conditions. Consider these criteria when choosing groundcovers:

Cold hardiness: pick plants rated to at least USDA zone 3 or 4 for northern and high-elevation Wyoming; zones 5 or 6 may be acceptable in warmer valleys.
Sun exposure: many low-water groundcovers prefer full sun. Choose shade-tolerant species only for protected, north-facing areas.
Soil drainage and type: most xeric groundcovers demand well-drained soils. Species that tolerate heavier or clay soils are more limited.
Spread and growth habit: some groundcovers form mats and choke weeds; others clump. Consider how they will interact with remaining lawn or beds.
Maintenance needs: some require periodic trimming, division, or spot-weeding to stay tidy.
Establishment water needs: low-water plants still need regular watering during the first season to root in.

Recommended low-water groundcover types and species for Wyoming

Below is a selection of proven, cold-hardy groundcovers that perform well in Wyoming-like conditions. For each entry I list typical hardiness, light needs, soil preferences, and practical takeaways.

Creeping thyme (Thymus serpyllum and cultivars)
Hardiness: USDA zones 4 to 9 (select hardy cultivars for zone 3-4 sites).
Light: full sun to light shade.
Soil: excellent drainage, tolerates rocky, alkaline soils.
Takeaway: fragrant, low mat-forming with summer flowers that attract pollinators. Use between stepping stones, as a lawn alternative in low-traffic areas, or along borders. Best in well-drained sites; avoid heavy clay.
Sedum (stonecrop species; e.g., Sedum spurium, Sedum acre)
Hardiness: many cultivars hardy to zones 3 and 4.
Light: full sun.
Soil: very well-drained, drought tolerant, tolerates poor soils.
Takeaway: succulent leaves store water; excellent for rock gardens, sunny slopes, and thin-soil patches. Low maintenance and minimal irrigation after establishment.
Creeping phlox (Phlox subulata)
Hardiness: USDA zones 3 to 9.
Light: full sun.
Soil: well-drained, tolerates sand and rocky soils; prefers neutral to alkaline pH.
Takeaway: early-spring flowering groundcover that forms colorful mats. Good for slopes and rock walls; moderate traffic only.
Juniper groundcovers (Juniperus horizontalis and cultivars)
Hardiness: many cultivars hardy to zone 2 to 4.
Light: full sun.
Soil: very tolerant of poor, rocky, alkaline soils; excellent wind tolerance.
Takeaway: evergreen habit gives year-round coverage. Use on slopes and erosion-prone areas. Not for high-traffic lawn replacement but ideal for low-maintenance parking buffers and open slopes.
Blue grama (Bouteloua gracilis)
Hardiness: USDA zones 3 to 8; native to the High Plains.
Light: full sun.
Soil: prefers well-drained soils; tolerant of dry and alkaline sites.
Takeaway: a native warm-season grass with a distinctive low, clumping habit. Very low water once established and an excellent choice for naturalized lawn replacements and prairie-style plantings.
Buffalo grass (Bouteloua dactyloides)
Hardiness: generally zones 4 to 8; choose cold-hardy cultivars for northern Wyoming.
Light: full sun.
Soil: tolerates a range of soils if drainage is adequate.
Takeaway: very low-mow alternative to turf; turns brown in winter but requires little irrigation. Establishes slowly and benefits from sod or plugs rather than seed in cold climates.
Sheep fescue (Festuca ovina) and hard fescues (Festuca brevipila)
Hardiness: excellent cold tolerance, zones 3 to 7.
Light: full sun to partial shade.
Soil: adapts to drier soils and lower fertility.
Takeaway: fine-textured clumping grasses that create informal groundcover. Use in mixes with native grasses or in transition zones between lawn and rock gardens.
Aurinia saxatilis (golden alyssum / rock cress)
Hardiness: zones 3 to 7.
Light: full sun.
Soil: prefers well-drained, alkaline soils and rocky fills.
Takeaway: early spring bloom and silvery foliage. Good for rock gardens and edging; tolerates the alkaline soils common in Wyoming.

How to decide between species: siting examples

Sunny, exposed slope with shallow rocky soil: choose juniper, sedum, creeping thyme, or creeping phlox.
Open yard with low traffic that you want to convert to low-water lawn: consider buffalo grass plugs or blue grama seed/plug mixes, possibly blended with sheep fescue or hard fescue in a transitional mix.
Rocky front bed adjacent to driveway (alkaline soil and road salt exposure): juniper or sedum varieties and aurinia perform well.
Small areas between pavers or stepping stones: creeping thyme or Sedum spurium.

Establishment and practical maintenance steps

Successful conversion requires more than plant selection. Follow these practical steps for reliable establishment and long-term performance:

Evaluate and prepare the site.
Remove existing turf in the planting area using sod removal, solarization, or sheet mulching depending on scale.
Correct major drainage problems. Most low-water groundcovers need free-draining soil. If water ponds for days, select different plants or improve drainage.
Test soil pH and amend only if necessary; many recommended plants tolerate alkaline soils, common in Wyoming.
Plant at the right time.
Best windows are early spring after frost risk declines or early fall about 6 to 8 weeks before the first hard freeze. Avoid hot midsummer planting without supplemental water.
Water strategically for establishment.
Most low-water species need regular, moderate watering during the first one to two growing seasons. Use deep, infrequent soakings rather than daily light sprays to encourage root growth.
Once established, reduce irrigation to mimic native precipitation patterns.
Mulch and soil protection.
Use a light mineral mulch or gravel for rock garden species; coarse mulch helps retain temperature and reduces evaporation without holding excess moisture.
Avoid thick organic mulches around low-growing mats that can encourage rot in winter.
Maintenance calendar.
Yearly spring clean-up: remove dead foliage, divide overly vigorous patches, and spot weed.
Minimal fertilization: most xeric groundcovers perform with little or no fertilizer; small applications in spring help if growth is poor.
Pruning: trim early-flowering mats after bloom to maintain density and appearance.

Planting layout and aesthetic considerations

Groundcovers can be used in multiple ways to improve function and appearance while reducing water use:

Replace narrow strips of lawn next to driveways and sidewalks with juniper or sedum.
Create meandering low-water “lawn” areas of blue grama or buffalo grass for play areas, with native wildflowers at borders.
Use creeping thyme between stepping stones for fragrance and pollinator benefit.
Mass phlox or sedum on slopes to reduce erosion and add spring and summer color.

When mixing species, group plants by water needs and height to simplify irrigation and maintenance.

Risks, limitations, and final takeaways

Low-water groundcovers are not a one-size-fits-all replacement for traditional turf. Expect limitations:

Traffic tolerance: many groundcovers cannot replace turf in high-use play areas. Blue grama and buffalo grass tolerate moderate use; creeping thyme tolerates light foot traffic.
Establishment irrigation: they are low-water only after establishment. Plan for one to two seasons of supplemental water.
Cold extremes and microclimates: choose truly cold-hardy cultivars and consider planting on sheltered sites in high-elevation locations.

Practical final takeaways:

Prioritize species rated for your USDA zone and local microclimate; native species (blue grama) are often the best long-term choice.
Improve drainage where necessary; most groundcovers perform poorly in poorly drained soils.
Plan for establishment irrigation and then taper off; deep, infrequent waterings build drought-hardy root systems.
Use a mix of evergreen and flowering groundcovers for year-round interest and ecological value.

By selecting plants adapted to Wyoming conditions and following basic establishment practices, you can significantly reduce water use and maintenance while creating a resilient, attractive landscape. Low-water groundcovers provide an effective strategy to supplement or partially replace thirsty turf in Wyoming yards, delivering long-term savings and ecological benefits without sacrificing curb appeal.