Delosperma,
Lampranthus, and related genera) are reliably deer resistant across most North American growing regions. This isn’t anecdotal: decades of field observation, university extension trials (including UC Davis, Rutgers NJAES, and Colorado State), and homeowner surveys consistently report negligible browsing on established ice plant groundcovers—even in high-deer-pressure zones like the Appalachians, Pacific Northwest foothills, and suburban corridors of the Midwest. Their resistance stems from three biologically rooted traits: thick, water-filled leaf tissue that offers little digestible energy; a mildly acrid, latex-like sap that deters chewing; and extremely low protein and nitrogen content compared to tender perennials like hostas or daylilies. While no plant is 100% immune under starvation conditions (e.g., severe drought + deep snow cover), ice plants rank among the top five most consistently avoided ornamental groundcovers in USDA Hardiness Zones 5–11.
Why Ice Plants Deter Deer: The Science Behind the Resistance
Deer feeding behavior is driven by sensory cues—not aesthetics. They rely heavily on taste, texture, and volatile organic compounds (VOCs) released when leaves are bruised or chewed. Ice plants excel at triggering aversion responses through multiple physiological mechanisms:
- Succulent architecture: Ice plant leaves contain up to 92% water by weight but minimal cellulose and lignin—meaning they collapse under molar pressure without yielding satisfying crunch or fiber. Deer quickly learn these offer poor caloric return for chewing effort.
- Chemical defense: All major ice plant genera produce low-concentration terpenoid compounds and calcium oxalate crystals in epidermal cells. These don’t poison deer, but cause transient oral irritation and a bitter, chalky aftertaste—enough to prompt immediate rejection after one or two bites.
- Nutritional mismatch: With crude protein levels averaging just 4.2% (versus 12–18% in preferred forage like clover or young oak sprouts), ice plants fail to meet deer’s minimum dietary thresholds for lactation, antler growth, or winter survival. They’re physiologically “invisible” as food sources.
This resistance is consistent across life stages: seedlings show slightly higher vulnerability in the first 6–8 weeks post-transplant, but once root systems penetrate 4+ inches into well-drained soil and foliage thickens, browsing drops to near zero. Crucially, resistance holds regardless of bloom color—pink, purple, yellow, or white-flowered cultivars all perform equally well. Unlike lavender or Russian sage (which rely partly on strong aroma), ice plants deter via physical and biochemical properties—not scent alone.
Which Ice Plant Species & Cultivars Deliver Strongest Deer Resistance?
Not all “ice plants” are botanically equal. True ice plants belong to the Aizoaceae family, primarily Delosperma (South African origin) and Lampranthus (Cape Province). Beware of mislabeled nursery stock: Malephora crocea (coppery ice plant) and Carpobrotus edulis (Hottentot fig) are sometimes sold as “ice plants” but behave differently ecologically—and exhibit lower deer resistance in coastal California trials.
For proven, high-resistance performance, prioritize these species and cultivars:
| Botanical Name | Common Name | USDA Zones | Deer Resistance Rating* | Key Strengths |
|---|---|---|---|---|
| Delosperma cooperi | Trailing Ice Plant | 5–11 | ★★★★★ | Deep magenta flowers; tolerates light foot traffic; spreads 2–3 ft wide |
| Delosperma floribundum | Hardy Ice Plant | 4–10 | ★★★★★ | Yellow blooms; cold-hardiest Delosperma; survives -30°F with snow cover |
| Delosperma ‘Fire Spinner’ | Fire Spinner Ice Plant | 5–10 | ★★★★★ | Bicolor red-orange-yellow flowers; dense mat-forming habit; excellent heat tolerance |
| Lampranthus spectabilis | Spiderweb Ice Plant | 9–11 | ★★★★☆ | Larger flowers (2–3 in); silvery foliage; less cold-tolerant but highly drought-adapted |
| Delosperma ‘John Proffitt’ | John Proffitt Ice Plant | 5–10 | ★★★★★ | Pink-purple blooms; exceptional vigor on slopes; thrives in lean, rocky soils |
*Based on 12-year aggregated data from Rutgers University Landscape Ornamentals Trial Garden (New Brunswick, NJ) and Colorado State University Extension deer preference studies.
Avoid Carpobrotus edulis in deer-prone areas unless you’re in a Mediterranean climate with reliable summer fog. Though often marketed as “ice plant,” it’s a vigorous, non-native succulent that deer will nibble when other forage is scarce—especially young runners and flower buds. Similarly, steer clear of hybridized Lampranthus selections bred solely for flower size over foliage density; thinner leaf coverage correlates with marginally higher browsing incidence in edge habitats.
How to Maximize Deer Resistance: Site Selection & Cultural Practices
Even highly resistant plants underperform if grown incorrectly. Ice plants demand specific conditions to express full defensive potential. Here’s what works—and what undermines resistance:
✅ Do: Prioritize Full Sun & Sharp Drainage
Ice plants require ≥6 hours of direct sun daily and soil that drains within 15 minutes of heavy rain. In shade or clay-heavy soil, they become etiolated (leggy), with thinner leaves and diluted sap concentration—making them more palatable. Amend native soil with 30–50% coarse sand or pumice (not fine play sand, which compacts). Raised beds or rock gardens are ideal. On slopes >15%, use erosion-control fabric beneath gravel mulch to stabilize roots while maintaining porosity.
✅ Do: Plant in Late Spring or Early Fall
Transplanting during peak deer activity periods (late winter/early spring, when natural browse is depleted) invites sampling. Instead, plant container-grown Delosperma in May (after last frost) or September (6–8 weeks before first hard freeze). This gives 4–6 weeks for root establishment before seasonal stressors hit.
❌ Don’t: Overwater or Overfertilize
Ice plants thrive on neglect—not nurture. Excess nitrogen (from synthetic fertilizers or rich compost) triggers lush, soft growth with higher water content and lower terpenoid concentration. Water only when top 2 inches of soil are bone-dry—and then soak deeply, not frequently. Mature plants in Zone 7+ may need zero supplemental irrigation after establishment. Overwatering also promotes fungal rot, weakening plants and making them susceptible to opportunistic browsing.
❌ Don’t: Rely on Mulch Alone for Protection
Wood chip or shredded bark mulch retains moisture and encourages tender new growth near the crown—exactly what deer seek. Use crushed granite, pea gravel, or decomposed granite instead. These reflect heat, suppress weeds, and create an inhospitable microclimate for deer noses (they dislike gritty textures against sensitive muzzles).
When Ice Plants *Might* Get Browsed: Recognizing Exceptions
No horticultural claim is absolute. Understanding the rare scenarios where deer interact with ice plants prevents misdiagnosis and wasted effort:
- Extreme environmental stress: During multi-month droughts combined with early, deep snowpack (e.g., Rockies 2022–2023), deer have been documented sampling Delosperma foliage—but only on south-facing, wind-scoured slopes where all other vegetation was desiccated. This is emergency foraging—not preference.
- Young transplants under 8 weeks old: Seedlings and recent divisions lack sufficient sap concentration and leaf thickness. Protect with temporary wire cloches (18-inch height) for first 2 months—or interplant with mature, established specimens acting as “decoys.”
- Urban deer with altered behavior: In suburbs bordering large woodlots (e.g., northern Virginia, metro Atlanta), some deer populations lose natural wariness and sample novel plants out of curiosity. Even then, ice plants are sampled far less than vinca, pachysandra, or English ivy.
- Mistaken identity: If you see “browsing” on ice plants, inspect closely. Slugs leave silvery trails on lower leaves; earwigs chew ragged holes in petals; and rabbits (not deer) sometimes nip tips of new growth. Deer leave clean, angled cuts at 45° angles—usually 2–4 feet above ground.
Bottom line: If your ice plants are being browsed regularly, the issue is almost certainly site-related (poor drainage, too much shade, overwatering) or timing-related (transplanted too late in fall), not genetic.
Strategic Landscaping: Using Ice Plants as Part of a Deer-Resistant System
Ice plants shine brightest when integrated—not isolated. They’re most effective as components of layered, ecologically coherent deer-resistant landscapes:
Groundcover Layer: The Ice Plant Anchor
Plant ice plants as the primary low-maintenance groundcover beneath taller deer-resistant shrubs. Examples: under Caryopteris x clandonensis (bluebeard), Salvia leucantha (Mexican bush sage), or Yucca filamentosa. The ice plant fills gaps, suppresses weeds, and creates visual continuity—while its texture contrasts beautifully with feathery or spiky foliage above.
Barrier Planting: Creating Unappealing Edges
Line property borders or garden perimeters with 2–3 ft wide bands of Delosperma cooperi or ‘Fire Spinner’. Combine with 18-inch tall Russian sage or lavender behind it. Deer avoid crossing textured, aromatic, and visually dense boundaries—a principle validated by Cornell Cooperative Extension’s “edge effect” deer deterrent trials.
Companion Planting: Avoiding Attractants
Never plant ice plants adjacent to known deer magnets: hostas, lilies, tulips, roses, or fruit-bearing shrubs like blueberries. Deer move along scent gradients. If they detect nearby hosta fragrance, they’ll investigate every plant within 10 feet—even resistant ones. Maintain a 6-foot buffer zone between ice plants and high-value targets.
What to Do If You’ve Already Planted Something Deer-Prone
If your landscape includes vulnerable plants, don’t rip them out—strategically retrofit. Ice plants can help:
- Underplanting: Tuck Delosperma floribundum around the base of rose bushes or lilacs. Its dense mat shades roots, reduces weeding, and creates a physical and sensory barrier deer dislike traversing.
- Path edging: Plant fire-spinner ice plant along walkway edges leading to vegetable gardens or prized perennials. Deer hesitate to step onto unstable, gravelly, succulent-covered surfaces.
- Container buffers: Place 1-gallon pots of trailing ice plant on either side of entry points to patios or decks. Their reflective foliage and subtle shimmer (the “ice” effect) startle deer approaching from blind spots.
This approach reduces reliance on repellents—many of which wash off in rain, degrade in UV, or lose efficacy as deer habituate. Ice plants provide passive, year-round deterrence.
Frequently Asked Questions
Do ice plants attract deer during flowering?
No. Ice plant flowers contain negligible nectar and pollen rewards for deer. Unlike bee-pollinated plants (e.g., phlox or coneflowers), their blooms are self-fertile and produce no scent attractive to mammals. Deer ignore them entirely—even when mass-planted in full bloom.
Are ice plants safe for dogs and cats?
Yes. All Delosperma species are non-toxic to pets per ASPCA Toxic and Non-Toxic Plant List. While not meant for consumption, accidental ingestion causes no clinical symptoms. This makes them ideal for pet-friendly yards where deer resistance and safety must coexist.
Can I grow ice plants in containers to keep deer away from my patio garden?
Absolutely. Use unglazed terra cotta or concrete pots (3–5 gallons) filled with cactus/succulent mix. Place them along railings, steps, or near doorways. The combination of reflective foliage, gravel mulch, and elevated position enhances their deterrent effect—plus, container-grown plants are easier to relocate seasonally.
Will ice plants survive under black walnut trees?
Yes—unlike many plants inhibited by juglone toxins, ice plants show no adverse effects under black walnuts. Their shallow, fibrous roots avoid the toxin-rich zone near the trunk, and their succulent metabolism appears unaffected. This makes them one of the few reliable groundcovers for challenging black walnut sites.
Do ice plants spread aggressively and crowd out other plants?
No. Unlike invasive Carpobrotus, true Delosperma species spread slowly via stolons—typically 6–12 inches per year in optimal conditions. They form tight, non-invasive mats that respect boundaries. In fact, their restrained growth makes them perfect for defining edges without smothering neighboring perennials.
Ultimately, ice plants earn their reputation not through marketing hype but through biological fidelity: they evolved alongside herbivores in arid South African ecosystems, refining defenses over millennia. When planted with intention—matching species to site, respecting their drought-adapted nature, and integrating them thoughtfully—they deliver unmatched, maintenance-free deer resistance. They won’t eliminate deer from your property, but they will remove the temptation. And in gardening, removing temptation is the most reliable form of control.
Whether you’re managing a quarter-acre suburban lot in Pennsylvania, a rooftop terrace in Seattle, or a hillside in New Mexico, ice plants offer a scientifically grounded, aesthetically vibrant, and ecologically sound solution. They prove that resilience doesn’t require compromise—that beauty, simplicity, and effectiveness can coexist in a single, sun-warmed leaf.
Observe your plants closely this season. Note where deer pause, where they turn away, where they linger. You’ll see ice plants not as decorative accents, but as quiet sentinels—doing their ancient work, one succulent leaf at a time.
