How to grow oregano
Family Lamiaceae. Hardy to USDA hardiness zone 5a+ (U.S. Department of Agriculture). Full sun. Ready in 80-90 days (perennial).
Sun
Full sun
Spacing
12-18 in
Days to harvest
80-90 days (perennial)
Hardiness
Zone 5a+
What growers actually recorded
Loading zone 7b results…
When to plant oregano
- Start indoors: ~8 weeks before last frost.
- Transplant out: ~2 weeks after last frost.
Companion plants for oregano
Plant with: Pepper, Tomato, Basil.
Common pests & problems
Rarely bothered.
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
Harvest just before flowering for the strongest flavor. Dries beautifully.
When to plant oregano 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 oregano
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
- Harvest heavily just before flower buds open. That's peak oil content.
- Cut back by half twice a season for a bushier plant.
- Air-dry in bunches for winter use.
Storing & keeping
Dried in airtight jars, 1+ year. Fresh in crisper, 1 week.
What to expect
Per plant: 1 lb dried per mature plant
Troubleshooting oregano
Weak flavor
Likely cause: Too rich soil or too much water
What to do: Grow lean and dry: under-water on purpose.
Growth is lush and green but the flavour is weak
Likely cause: Too much nitrogen and water dilute the essential oils
What to do: Stop fertilising, cut back watering, and give full sun. Flavour concentrates in lean, dry conditions.
Centre of the plant dies out while the edges keep growing
Likely cause: Age and a woody crown, normal for a mature subshrub
What to do: Divide in spring, replant the vigorous outer sections, and shear by a third after flowering to keep growth young.
Varieties worth growing
Greek
Highest carvacrol content. The strongest, most authentic flavor.
Italian
Milder; the pizza herb.
Growing oregano in containers
10 in deep pot with sharp drainage; overwinters in zone 5+.
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
Is oregano the same as marjoram?
Same genus (Origanum), different species. Marjoram is milder and sweeter.
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.