How to grow thyme
Family Lamiaceae. Hardy to USDA hardiness zone 5a+ (U.S. Department of Agriculture). Full sun. Ready in 75-90 days (perennial).
Sun
Full sun
Spacing
10-12 in
Days to harvest
75-90 days (perennial)
Hardiness
Zone 5a+
What growers actually recorded
Loading zone 7b results…
When to plant thyme
- Start indoors: ~8 weeks before last frost.
- Transplant out: ~2 weeks after last frost.
Companion plants for thyme
Plant with: Cabbage, Strawberry, Eggplant.
Common pests & problems
Deters cabbage worms.
Feeding & fertilizer
N-P-K ratio: Low fertilizer: herbs go bland when overfed
Organic options: Compost once at planting · Weak fish emulsion once mid-season if pale · Nothing after that
When to feed: Feed lightly if at all. Mediterranean herbs (rosemary, thyme, oregano) thrive in lean soil.
Watch for: Fast, floppy, weak-flavored growth = too rich.
N = nitrogen (leaves), P = phosphorus (roots and flowers), K = potassium (fruit and disease resistance). How to read a fertilizer label →
Grower's tip
Needs sharp drainage. Plant in gravelly soil or a raised bed edge. Never wet feet.
When to plant thyme in your zone
Free month-by-month sowing and transplanting lists, built from frost dates for your USDA (United States Department of Agriculture) hardiness zone.
Soil & water for thyme
Soil & pH
6.0-7.5
Well-drained, on the lean side. Mediterranean herbs rot in rich wet soil.
Compost once at planting, then leave the bed alone. Add grit or perlite for rosemary and thyme.
Watering
0.5-1 in / week: under-water rather than over-water
Deep, infrequent watering builds essential oils and flavor.
Pinch a leaf and smell it. If the aroma is weak and the growth is soft and floppy, the plant is over-watered or over-fed. If the leaf is stiff and fragrant, you're doing it right.
Knowing when to harvest
- Snip stems just before flowering.
- Cut sprigs about 5 in long; strip leaves off the woody stem.
- Never cut into old wood: plant may not recover.
Storing & keeping
Dry hanging in bunches: 1+ year. Fresh: crisper 2 weeks.
What to expect
Per plant: 0.5 lb dried per plant per year
Troubleshooting thyme
Woody, sparse growth
Likely cause: Old plant or over-water
What to do: Prune in spring; replace every 3-4 years; sharp drainage.
Stems blacken at the base and the plant collapses over winter
Likely cause: Wet, poorly drained soil around the crown
What to do: Plant on a slight mound, mulch with gravel rather than bark, and avoid winter irrigation. Thyme tolerates drought far better than damp.
Plant becomes sprawling and bare in the middle
Likely cause: Unpruned woody growth
What to do: Shear the top third in early spring and again after bloom. Avoid cutting into bare wood, which does not resprout reliably.
Varieties worth growing
English (Common)
The kitchen standard.
Lemon
Citrus note; excellent with fish.
Creeping (Elfin)
Ornamental groundcover; still edible.
Growing thyme in containers
8 in deep pot with gravel-heavy mix; perfect balcony plant.
Nutrition
Volatile oils that hold up after drying: rosmarinic acid in rosemary, thymol in thyme, menthol in mint, eugenol in basil and oregano. That's why a pinch of dried herb often tastes stronger than a handful of fresh. The oils are concentrated once the water leaves.
Common questions
Why is my thyme dying?
Almost always wet feet. Rebuild with sharp drainage: 50% grit or perlite.
Where these numbers come from
- USDA Plant Hardiness Zone Map (2023 revision). Zone assignment and the 30-year normals behind every cold-hardiness figure.
- NOAA NCEI 1991-2020 Climate Normals. Frost dates, growing-season length, and the probability bands on both.
- Cornell, UMN, and UC Davis Cooperative Extension crop guides. Spacing, days to maturity, soil pH targets, and per-plant yield ranges.
- USDA FSIS / FDA Produce Safety guidance. Wash, cure, and cold-storage handling numbers.
Ranges are regional guidance, not a promise for your yard. Your own logged results always override the published range.