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How to Grow Wiltonii

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Wiltonii

Thymus serpyllum 'Wiltonii'

herb

Wiltonii is a creeping thyme cultivar that forms a dense, low-growing mat of tiny, dark green foliage. It produces delicate purple-pink flowers in summer and is widely used as a ground cover, in rock gardens, and between pavers. This aromatic herb is a dwarf variety of wild thyme, typically reaching only 2-3 inches in height.

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Example Wiltonii timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Wiltonii

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Wiltonii

    Around Jun 16

    ≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Wiltonii dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily (tolerates partial shade but prefers full sun)
💧
Water: Low water needs once established. Water sparingly; allow soil to dry between waterings. Drought-tolerant once mature.
📏
Spacing: 6-12 inches
📅
Days to maturity: 60-90 days to establish as ground cover
🌱
Planting depth: 0.25 inches (seeds); plant transplants at soil line

Soil

Type: Well-draining sandy loam or gravel-based soil
pH: 6.0-7.5
Amendments:
Perlite or coarse sand for drainage Gravel mulch

Growing Zones

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Thrives in zones 3-9, with best performance in zones 4-8

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

1

Seedling

2-3 weeks

Tiny seedlings emerge with minimal cotyledons and first true leaves. Very delicate appearance.

Keep soil lightly moist but not waterlogged. Protect from wind and intense heat. Thin seedlings to proper spacing.

2

Establishment

4-8 weeks

Young plants develop dense foliage mats, beginning to spread horizontally. Roots establish deeply.

Reduce watering gradually. Begin light pruning to encourage bushier growth and mat formation.

3

Vegetative Growth

Spring through early summer

Mature mat-forming growth with dense, tight foliage covering. Plant spreads laterally across ground.

Minimal watering needed. Trim edges to maintain shape. Remove any dead patches. Very low maintenance.

4

Flowering

4-8 weeks (June-August)

Delicate purple-pink flowers appear on short stems above the foliage mat, creating a colorful display.

Allow flowers to bloom for pollinator attraction. Deadheading extends flowering but is optional.

5

Dormancy/Winter

November-March (depending on zone)

Foliage remains evergreen but may bronze or darken in cold climates. Growth slows dramatically.

No watering needed in winter. Foliage provides winter interest. Extremely cold-hardy.

Companion Planting

Plan your garden →

Plant with:

Sedum Sempervivum (Hens and Chicks) Lavender Catmint Creeping phlox Ornamental grasses Dianthus Saxifrage

Avoid planting near:

Plants requiring heavy watering (hostas, ferns, astilbe) Tall shade-casting plants that block sunlight

Common Pests

  • Spray with water to dislodge; use insecticidal soap if severe. Ensure good air circulation.

  • Improve drainage immediately. Remove affected foliage. Reduce watering frequency.

  • Ensure excellent drainage. Do not overwater. Replace soil if necessary.

Uses

🍳

Culinary herb for teas and seasoning

Culinary

Wiltonii leaves can be used fresh or dried to make aromatic tea with a mild minty flavor. The herb adds subtle flavor to soups, stews, and savory dishes. [source]

💊

Respiratory and digestive support

Medicinal

Thyme has been traditionally used in herbal medicine for cough relief and to support respiratory and digestive health due to its aromatic volatile oils. [source]

🏠

Ground cover and landscape design

Household

Wiltonii is ideal for covering bare soil, planting between pavers, edging pathways, and creating living mulch in rock gardens. It suppresses weeds while requiring minimal maintenance. [source]

🦋

Pollinator and beneficial insect support

Wildlife

Summer flowers attract bees, butterflies, and other pollinators. The dense mat also provides habitat and shelter for beneficial ground-dwelling insects. [source]

🎨

Dried herb for potpourri and crafts

Craft

Dried Wiltonii foliage and flowers can be used in dried flower arrangements, herbal wreaths, and aromatherapy crafts. The plant retains its fragrance well when dried. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Pinch off leaves and small stems throughout growing season for fresh culinary use. Best harvested in morning after dew dries. Can be dried for long-term storage by hanging bundles in a warm, airy space.

Fun Facts

  • 🌱 Wiltonii is named after its creator or origin, representing a cultivated selection of the wild creeping thyme (Thymus serpyllum) native to Mediterranean regions.
  • 🌱 In ancient Greece and Rome, thyme was a symbol of courage and was burned as incense in temples. Warriors would wear sprigs for strength before battle.
  • 🌱 Wiltonii is so tough that it can be walked upon lightly and will actually release more fragrance when crushed underfoot, making it perfect for fragrant garden pathways.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Deadhead Full Sun Partial Shade True Leaves
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