How to Grow Silver Thyme
Eucalyptus gunnii
Silver Thyme is actually Eucalyptus gunnii, a tender perennial shrub often mistaken for culinary herbs due to its name. Gardeners value this plant for its striking silver foliage, drought tolerance, and ability to thrive in full sun across USDA zones 7 through 10.
📷 Wikimedia CommonsStarting Silver Thyme: indoors or direct sow?
🌾 Sow directly in the garden — Silver Thyme is not usually started indoors.
Do not transplant before the last frost; move seedlings outdoors only after all danger of frost has passed and soil temperatures have warmed sufficiently for this tender perennial.
Soil, care & harvest
Prepare well-drained soil with a pH between 6.0 and 8.0 before sowing seeds. Since Eucalyptus gunnii is not a cool-season crop like peas or lettuce, do not sow it weeks before the last frost; instead, start seeds indoors after all danger of frost has passed in your area. Plant seeds at a depth of about half their size and expect germination to occur within 14 to 21 days under warm conditions.
Space plants 12 to 15 inches apart to allow proper air circulation, which prevents root rot. Provide full sun exposure for at least six hours daily. Once established, water moderately but avoid overwatering, as this plant prefers dry conditions. Apply a light layer of mulch to retain moisture and suppress weeds without smothering the roots.
Watch for spider mites in hot, dry weather by increasing humidity or using insecticidal soap, and ensure excellent drainage to prevent root rot. While often confused with culinary herbs, this species is grown primarily for ornamental value rather than harvest. It typically reaches maturity in 120 to 150 days from sowing, at which point you can enjoy its foliage.
When to Plant Silver Thyme
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
Companion Plants for Silver Thyme
✓ Good companions
Thyme repels cabbage worms and flea beetles that damage brassicas
Thyme repels carrot rust flies and other root vegetable pests
Thyme deters flea beetles that commonly attack eggplant leaves
Compatible Mediterranean herbs that deter pests and attract pollinators
Compatible Mediterranean herbs with similar care needs and pest-repelling properties
Similar growing conditions, both repel cabbage moths and carrot flies
Thyme repels ants and improves strawberry flavor and growth
Thyme deters hornworms and aphids while improving tomato flavor
✗ Keep away from
Releases juglone toxin that inhibits growth of most herbs including thyme
Requires more water and different growing conditions than drought-tolerant thyme
Aggressive spreader that competes for space and nutrients, different water needs
Nutrition Facts
Per 100g serving (USDA FoodData Central)
