Pest Control
Do Deer Eat Lavender Plants? The Truth & Protection Guide
The Short Answer: Are Lavender Plants Truly Deer-Proof?
Homeowners frequently ask: do deer eat lavender plants? The short answer is no, lavender is highly deer-resistant. However, in wildlife management, there is a critical distinction between "deer-proof" and "deer-resistant." According to the Rutgers New Jersey Agricultural Experiment Station, most Lavandula species are rated Level B (Seldom Severely Damaged). While mature lavender is rarely browsed, young transplants or plants subjected to extreme winter starvation pressure can still fall victim to opportunistic feeding.
Understanding the biological reasons behind this resistance—and the specific edge cases where it fails—is the key to integrating lavender into a comprehensive pest management strategy for your landscape.
The Chemical Defense: Linalool and Camphor
Deer possess approximately 297 million olfactory receptors (compared to a human’s 5 million). They rely heavily on scent to locate high-calorie forage. Lavender produces high concentrations of volatile organic compounds (VOCs), specifically linalool, linalyl acetate, and camphor. These terpenes act as a powerful olfactory disruptor.
Expert Insight: English lavender (Lavandula angustifolia) contains higher concentrations of camphor and linalool than Spanish (Lavandula stoechas) or French (Lavandula dentata) varieties. If deer pressure is severe in your USDA zone, always select English cultivars like ‘Hidcote’ or ‘Munstead’ for maximum chemical defense.
When a deer approaches a lavender bush, the intense aromatic oils overwhelm their scent receptors, effectively masking the smell of more palatable plants nearby and signaling to the animal that the foliage will be unpalatable and difficult to digest.
The Starvation Exception: When Deer Will Browse Lavender
While lavender is a reliable deterrent 90% of the time, Penn State Extension notes that extreme environmental stress alters deer foraging behavior. You must monitor your lavender during these high-risk windows:
- Late Winter (February–March): When snow cover is deep and natural forage is depleted, deer enter a caloric deficit. They will sample toxic or highly aromatic plants, including lavender, out of sheer desperation.
- Fawn Learning Phases (June–July): Young fawns are still learning what is safe to eat. They frequently "taste-test" aromatic plants before learning to avoid them.
- Drought Stress: Lavender plants suffering from severe drought stress produce fewer essential oils, reducing their aromatic defense and making the tender new growth more palatable.
Companion Planting Matrix: Lavender as a Deer Shield
Rather than planting lavender in isolation, use it as a biological perimeter shield to protect highly vulnerable ornamentals. The table below outlines optimal companion planting strategies based on scent-masking efficacy and spatial requirements.
| Vulnerable Target Plant | Lavender Cultivar Shield | Spacing Requirement | Scent Masking Efficacy |
|---|---|---|---|
| Hostas (Hosta spp.) | ‘Hidcote’ (Compact, high oil) | 18-24 inches from target | High (Dense foliage) |
| Daylilies (Hemerocallis) | ‘Provence’ (Tall, vigorous) | 24-36 inches from target | Moderate (Airy growth) |
| Tulips (Tulipa) | ‘Munstead’ (Early blooming) | 12-18 inches from target | High (Ground-level density) |
| Arborvitae (Thuja) | ‘Grosso’ (Massive spread) | 36-48 inches from trunk | Moderate (Protects lower branches) |
Protecting Young Transplants: A 90-Day Protocol
The most common failure mode for lavender is browsing damage during the first 90 days after transplanting. Nursery-grown lavender is often grown in controlled greenhouses and lacks the immediate environmental stressors required to produce peak levels of defensive terpenes. Follow this exact protocol to bridge the gap:
Weeks 1–4: The Olfactory Camouflage Phase
Apply a putrescent whole egg solid repellent, such as Liquid Fence Deer & Rabbit Repellent (Active ingredient: 4.65% putrescent whole egg solids).
Cost: ~$24–$28 per gallon concentrate.
Application: Dilute to label rate and spray directly on the foliage until runoff. Reapply every 7 days or after 1 inch of rainfall. The sulfur compounds mimic the scent of predator decay, triggering an immediate flight response.
Weeks 5–8: The Soil-Based Deterrent Phase
Transition to Milorganite (5-2-0 NPK, derived from heat-dried microbes, 6% iron).
Cost: ~$18–$22 per 32 lb bag.
Application: Broadcast 5 lbs per 250 square feet around the base of the lavender. Milorganite acts as both a mild, slow-release nitrogen fertilizer and a powerful olfactory deterrent. According to the University of Maryland Extension, the distinct biosolid odor of Milorganite effectively disrupts deer feeding patterns without harming the plant’s root system.
Weeks 9–12: Hardening Off and Weaning
Reduce repellent applications to every 14 days. By week 12, the lavender’s root system should be established, and exposure to full sun and wind will trigger the natural production of linalool and camphor. Discontinue chemical repellents and rely on the plant’s natural defenses.
Physical Barrier Specifications for Severe Pressure
If you live in an area with high herd density (more than 30 deer per square mile), companion planting and repellents may not be enough during winter. You must install physical barriers. Deer are capable of jumping 8 feet vertically, but they struggle with depth perception when jumping.
"A 5-foot slant fence set at a 45-degree angle away from the garden is often more effective and less visually obtrusive than an 8-foot vertical fence. Deer will not attempt to jump a barrier if they cannot clearly see the landing zone on the other side."
- Vertical Woven Wire: Minimum 8 feet tall. Use 14-gauge galvanized wire with 2x4 inch mesh at the bottom to prevent fawns from crawling underneath.
- Slant Fencing: 5 feet tall, angled outward at 45 degrees. Cost-effective and uses standard T-posts and polywire or welded wire panels.
- Individual Cages: For single specimen lavender plants, use 4-foot tall tomato cages wrapped in deer netting (3/4 inch mesh) during the winter months. Remove in early spring to allow for pollinator access and proper air circulation.
Troubleshooting Browsing Damage
If you discover that your lavender has been eaten, do not immediately assume deer are the culprit. Use this diagnostic checklist:
- Inspect the Cut: Deer lack upper incisors, meaning they tear and rip foliage, leaving jagged, frayed edges. If the stems are cut cleanly at a 45-degree angle, the culprit is likely rabbits or groundhogs.
- Check the Height: Deer browse typically occurs between 18 inches and 5 feet off the ground. Damage lower than 12 inches is almost always caused by rabbits, voles, or mechanical weed-whacker damage.
- Pruning Protocol: If deer have damaged the lavender, wait until early spring (after the last hard frost) to prune. Cut back to the first set of green leaves below the damage. Never cut into the old, woody base of the lavender, as Lavandula species struggle to regenerate from leafless woody tissue.
By understanding the biochemical defenses of lavender and implementing targeted protection during vulnerable growth stages, you can successfully integrate these aromatic perennials into your landscape without losing them to local wildlife.
