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 the space
Not every name in a seed catalog. These are the ones growers order again, with what each one is actually good at and what it asks of you.
German Winter
Open-pollinated
Hardiest culinary thyme; survives northern winters in the ground.
Lemon thyme
Open-pollinated
Citrus note for fish and chicken; less hardy, so pot it and bring it in.
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.