plant library
Xeriscape plants — water-wise garden 20 picks (zones 4-10)
Twenty xeriscape plants for water-wise gardens — agave, yucca, sedum, Russian sage, lavender — across USDA zones 4-10 with Denver Water's 7 principles.
Xeriscape plants — water-wise garden 20 picks (zones 4-10)
Xeriscape gardening was born in Denver, Colorado, in 1981. Denver Water — facing a hot dry climate and rising water demand — assembled a task force that coined the term from "landscape" plus the Greek xeros ("dry"), and codified seven design principles that have since been adopted across the western US, Australia, southern Europe and increasingly the UK. The result is a garden that needs 50-80% less water than a traditional lawn-and-flowerbed plot, supports more pollinators per square metre and is genuinely low maintenance. This guide explains the seven principles and lists 20 reliable xeriscape plants across USDA zones 4-10 with ASPCA pet-safety flags for each.
Try Growli: Photograph your garden and Growli will measure water use risk, suggest xeriscape conversions and recommend plants matched to your specific zone and soil.
The seven principles of xeriscape
Denver Water's framework remains the canonical reference. The seven principles are:
1. Planning and design
Map your site before planting. Note sun hours, slope, soil type, existing trees and where water flows naturally. Group plants by water need (hydrozoning) so thirsty species share a bed and drought-tolerant species share another. Most xeriscape failures stem from skipping this step.
2. Soil improvement
Counter-intuitively, low-water plants often need better soil than typical perennials — sharp drainage is critical, especially in heavy clay regions. Amend with compost and grit at planting depth (30 cm) so roots can develop deeply. Established roots reach soil moisture that lawn-rooted plants cannot.
3. Efficient irrigation
Drip irrigation delivers water directly to roots with 90%+ efficiency vs ~50% for sprinklers. Even xeriscape beds need water in year one to establish; well-designed drip is the difference between a successful xeriscape and a dead one in establishment season.
4. Mulching
5-7 cm of gravel, rock or organic mulch reduces surface evaporation by 50-70% and suppresses weeds. Gravel suits Mediterranean and desert species; bark or composted shred suits prairie species. Mulch is non-negotiable in a xeriscape — it is the difference between watering monthly and watering weekly.
5. Practical turf areas
Turn down lawn area to functional minimum. A 50% turf reduction can cut a household's outdoor water use by 30-50%. Keep lawn where children play; convert peripheral lawn to mixed planting, gravel paths or hardscape.
6. Low water plants
The plant list. Choose species adapted to your specific climate, soil and zone. The 20 picks below cover the full USDA range 4-10. Most xeriscape failures stem from buying plants on impulse rather than to a planned plant list.
7. Maintenance
Xeriscape is low maintenance, not no maintenance. Expect a spring tidy (cut back perennial dead growth, top up mulch), occasional deep watering in extreme heat, and an autumn cut-back of grasses. Total maintenance: about 4-6 hours per year for a small xeriscape bed.
20 reliable xeriscape plants by zone
Cold-hardy backbone (zones 3-7)
1. Sedum (stonecrop) — Sedum / Hylotelephium spp.
Succulent perennial, 5-60 cm. 'Autumn Joy' (now Hylotelephium 'Herbstfreude') is the most-planted. USDA zones 3-9. Pet safety: Most Sedum species are non-toxic per ASPCA.
2. Russian sage — Salvia yangii
Silvery aromatic woody perennial, 90-120 cm. Violet-blue spires July-September. USDA zones 4-9. Pet safety: Generally non-toxic; not on ASPCA toxic list.
3. Yarrow — Achillea millefolium
Flat-headed daisy relative, 50-90 cm. June-September. USDA zones 3-9. Pet safety: TOXIC to dogs, cats and horses per ASPCA — causes drooling, vomiting.
4. Echinacea (purple coneflower) — Echinacea purpurea
Native US prairie daisy, 60-90 cm. July-September. USDA zones 3-9. Pet safety: Non-toxic per ASPCA.
5. Agastache (hyssop) — Agastache foeniculum
Aromatic tall perennial, 60-120 cm. July-September. USDA zones 4-9. Pet safety: Generally non-toxic; not flagged on ASPCA list.
Mediterranean and dry-adapted (zones 5-9)
6. Lavender — Lavandula angustifolia
Aromatic Mediterranean shrub, 30-60 cm. June-July bloom. USDA zones 5-9. Pet safety: Mildly toxic in large quantities per ASPCA.
7. Rosemary — Salvia rosmarinus
Evergreen shrub, 60-150 cm. USDA zones 7-10. Pet safety: Generally non-toxic per ASPCA — large ingestions may cause GI upset.
8. Oregano — Origanum vulgare
Aromatic ground cover or low mound, 30-60 cm. USDA zones 5-10. Pet safety: ASPCA lists oregano as toxic to dogs and cats — usually mild GI upset.
9. Thyme — Thymus vulgaris, creeping thymes
Aromatic ground cover, 5-15 cm. USDA zones 5-9. Pet safety: Non-toxic per ASPCA.
10. Butterfly bush — Buddleja davidii
Aromatic fast-growing shrub, 1.5-3 m. July-October. Note: Invasive in parts of the US — confirm local status before planting. USDA zones 5-10. Pet safety: Generally non-toxic; not flagged on ASPCA list.
Ornamental grasses (zones 4-9)
11. Blue fescue — Festuca glauca
Cool-season clumping grass, 20-30 cm. USDA zones 4-8. Pet safety: Non-toxic per ASPCA.
12. Fountain grass — Pennisetum alopecuroides
Warm-season clumping grass, 60-120 cm. Bottle-brush plumes August-October. USDA zones 5-9. Pet safety: Generally non-toxic; not flagged on ASPCA list.
13. Mexican feather grass — Nassella tenuissima (formerly Stipa tenuissima)
Wispy fine-textured grass, 40-60 cm. USDA zones 6-10. Note: Invasive in parts of California — confirm local status. Pet safety: Generally non-toxic; not flagged on ASPCA list.
14. Switchgrass — Panicum virgatum
Native US prairie grass, 1-1.8 m. USDA zones 4-9. 'Heavy Metal' (blue-green) and 'Shenandoah' (red autumn colour) are reliable. Pet safety: Non-toxic per ASPCA.
Hot and arid (zones 7-10)
15. Agave — Agave americana, A. parryi, A. ovatifolia
Sculptural rosette-forming succulent, 60 cm to 2.5 m. Bloom spike at maturity (10-30 years), then plant dies. USDA zones 8-10 (some species to zone 5 with sharp drainage). Pet safety: TOXIC to dogs and cats per ASPCA — Agave americana contains calcium oxalate raphides. Drooling, vomiting, oral irritation.
16. Yucca — Yucca filamentosa, Y. gloriosa, Y. rostrata
Sword-leaved evergreen, 60 cm to 2 m. Tall white flower spike in summer. USDA zones 4-10 depending on species. Pet safety: TOXIC to dogs and cats per ASPCA — contains saponins.
17. Prickly pear — Opuntia spp.
Hardy native cactus, 30 cm to 2 m. Yellow, red or pink summer flowers; edible red fruit. USDA zones 4-10 depending on species. Pet safety: Generally non-toxic; spines and glochids are the bigger concern.
18. Penstemon (beardtongue) — Penstemon spp.
Tubular flower spires in red, pink, purple or white, 30-90 cm. May-July. USDA zones 3-10 depending on species. Pet safety: Non-toxic per ASPCA.
19. Salvia greggii (autumn sage) — Salvia greggii
Compact aromatic shrub, 60-90 cm. Red, pink, white or coral flowers April-November. USDA zones 7-10. Pet safety: Salvia species are generally non-toxic per ASPCA.
20. Lantana — Lantana camara
Trailing or mounding shrub, 30-90 cm. Multi-colour flower clusters May-October. USDA zones 8-11 (annual in colder zones). Note: Invasive in some US states — confirm local status. Pet safety: TOXIC to dogs, cats and horses per ASPCA — triterpenoids cause vomiting, weakness, jaundice.
Xeriscape plant pairings by zone
Zone 4-5 (cold continental — Colorado, Montana, UK Scotland)
Russian sage + echinacea + yarrow + blue fescue + sedum 'Autumn Joy' + agastache. Add prairie grasses (switchgrass, Schizachyrium) for autumn structure.
Zone 6-7 (temperate — Pacific Northwest, UK southern England)
All of the above + lavender + thyme + rosemary (in sheltered spots) + penstemon + fountain grass. Add salvia 'Caradonna' and oregano for cottage-meets-xeriscape mix.
Zone 8-9 (warm temperate — California, US South, Mediterranean Europe)
Lavender + rosemary + thyme + salvia greggii + penstemon + agave parryi + yucca filamentosa + Mexican feather grass + sedum. Add prickly pear and butterfly bush (where non-invasive).
Zone 10 (subtropical — Florida, Texas Gulf, Arizona desert)
Agave americana + yucca rostrata + prickly pear + lantana (where non-invasive) + salvia greggii + rosemary + bougainvillea + ornamental grasses. The fully xeric desert palette.
The cost — and the savings
Conversion cost (UK and US, 2026 typical figures for a 20 m² bed):
| Item | Approximate cost |
|---|---|
| Soil amendment (grit, compost) | £80-150 / $100-200 |
| Gravel mulch (5 cm depth) | £100-180 / $120-220 |
| 20-30 plants | £200-400 / $250-500 |
| Drip irrigation (manifold + emitters) | £80-150 / $100-200 |
Total: roughly £460-880 / $570-1,120 for a 20 m² xeriscape bed converted from lawn.
Water savings: a 20 m² lawn in a hot summer (US Southwest, southern Spain, dry summer in the UK) uses 8,000-16,000 litres / 2,100-4,200 US gallons of water. A xeriscape bed of the same size uses around 1,000-2,500 litres in establishment year and 200-800 litres from year two. Payback through water savings is typically 3-7 years; maintenance time savings are immediate.
Try Growli: Send Growli your lawn dimensions, zone and water rates and we will model the water and maintenance savings of converting to xeriscape.
Common xeriscape mistakes
- Skipping the soil amendment. Heavy clay drowns drought-tolerant species. The single biggest cause of xeriscape failure.
- Forgetting irrigation in year one. Even xeriscape plants need establishment water. Drip on a timer for the first season is essential.
- Going "zero turf" too fast. Keep some functional lawn for children, pets and casual sitting. The xeriscape ethic is practical turf, not no turf.
- Planting invasive species. Mexican feather grass, lantana, butterfly bush and Russian olive are invasive in parts of the US — confirm local lists before buying.
- Choosing plants that match the look you want rather than your actual zone. Agave fails outside zone 8 unprotected. Lavender struggles in zone 10 humidity. Buy to your zone, not to a Pinterest board.
Related articles
- Drought tolerant garden plants — 18 picks for low-water beds
- Full sun perennials — 15 picks for 6+ hours direct light
- Types of flowers — 20+ annuals & perennials for any garden
- Companion planting guide
- Mulching guide — how to mulch garden beds
- Types of grass — lawn varieties and uses
Reviewed and updated by the Growli editorial team. For questions about anything here, open Growli and ask — or email hello@getgrowli.app.
Frequently asked questions
What are xeriscape plants?
Xeriscape plants are species adapted to low-water conditions — once established, they survive on natural rainfall in their target climate with minimal supplemental irrigation. The category includes succulents (agave, yucca, sedum), Mediterranean shrubs (lavender, rosemary, thyme), native prairie perennials (echinacea, Russian sage, yarrow) and ornamental grasses (blue fescue, fountain grass, switchgrass). Choose by your USDA hardiness zone.
What are the 7 principles of xeriscaping?
Denver Water, which coined the term in 1981, defined seven principles: 1) planning and design, 2) soil improvement, 3) efficient irrigation, 4) mulching, 5) practical turf areas, 6) low-water plants and 7) appropriate maintenance. Xeriscape is a design framework, not a specific style or plant list — the same principles produce a desert palette in Arizona and a Mediterranean palette in Devon.
Are xeriscape plants safe for pets?
Some are, several are not. Agave, yucca, yarrow and lantana are toxic to dogs and cats per ASPCA. Oregano is mildly toxic. Lavender is mildly toxic in large quantities. Pet-safe xeriscape picks include echinacea, sedum, Russian sage, rosemary, thyme, fountain grass, blue fescue, switchgrass, prickly pear (avoid spines), penstemon and salvia greggii. Build pet-grazed beds around the non-toxic picks.
How much water does a xeriscape garden save?
A typical xeriscape conversion cuts outdoor water use by 50-80% vs traditional lawn-and-flowerbed landscaping. Denver Water data shows households that converted to xeriscape used 30-50% less total water (indoor + outdoor) in summer months. Year one of a xeriscape needs significant water for establishment; year two and beyond drop to occasional deep watering only in extreme heat.
Do xeriscape gardens work in cold climates?
Yes — xeriscape is about water efficiency, not heat. Denver itself sits at over 1,600 m elevation with USDA zone 5b winters and consistent snow. The cold-hardy xeriscape palette (zones 3-6) includes Russian sage, echinacea, yarrow, sedum, blue fescue, switchgrass, prairie clover, agastache and creeping thyme. UK Scottish gardens (zone 7-8 with cool wet summers) suit lavender, thyme, sedum and ornamental grasses with sharp drainage.
Can I xeriscape a small urban garden?
Yes — and small gardens benefit most because the conversion is cheap and quick. A 10 m² patch of dry-tolerant planting against a sunny wall can hold 15-20 species and feed dozens of pollinators. Use gravel mulch, drip irrigation on a single hose timer and select plants from the Mediterranean palette (lavender, rosemary, thyme, salvia, sedum, lamb's ear). Container xeriscape on terraces and balconies works equally well.
What is the difference between xeriscape and drought tolerant gardening?
Drought tolerant refers to individual plants that survive dry periods. Xeriscape is the whole-garden design framework — seven principles that together produce a low-water landscape. A xeriscape uses drought-tolerant plants as one of its seven principles, plus soil amendment, mulch, efficient irrigation, turf reduction, planning and maintenance. See our [drought tolerant garden plants](/blog/drought-tolerant-garden-plants) guide for plant-level detail.
How do I convert a lawn to xeriscape?
Step 1: kill the lawn (cardboard smother for 8-12 weeks, glyphosate where legal, or strip with a sod cutter). Step 2: amend soil 30 cm deep with compost and grit. Step 3: install drip irrigation. Step 4: plant from the appropriate zone palette at 40-60 cm spacing. Step 5: mulch 5-7 cm deep with gravel (Mediterranean species) or composted shred (prairie species). Step 6: water weekly through year one, then taper to occasional deep watering only.