Zone 4 · Herbs Growing Guide

When to Plant Oregano
in Zone 4

Perennial Mediterranean herb that gets more flavourful in hot dry conditions. Greek oregano is most aromatic. Harvest before flowering — flavour is strongest just before flowers open.

Plant outdoors
May 1 – May 20
Start indoors
Mar 15 – Apr 1
Last Frost
~May 1
Days to harvest
60–90 days
Difficulty
Easy
Plant now — Zone 4
Harvest window: May – Oct

Planting Calendar

In Zone 4, Oregano should be planted outdoors May 1 – May 20, after the average last frost date of approximately May 1. Start seeds indoors around Mar 15 – Apr 1 for a head start.

Perennial. Established plants spread to form large clumps. Divide every 3 years.

Care Guide

Sunlight
Full sun · 6–8 hrs/day
Watering
Low
Spacing
12–18 inches
Soil
Well-draining, low to moderate fertility
Days to maturity
60–90 days
Soil pH
6.0–8.0
plant tip · Zone 4

Perennial. Established plants spread to form large clumps. Divide every 3 years.

Feeding Schedule

How often
once a season
Feed type
balanced (10-10-10)
Key timing
early spring

Like all Mediterranean herbs, over-feeding reduces flavour. One light feed in spring is ideal.

Companion Planting for Oregano

What you plant next to oregano makes a real difference — some plants actively help, others compete or attract pests.

Grows well with
  • Tomatoes
  • Peppers
  • Beans
  • Brassicas
Keep away from
  • Basil
  • Mint

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Common questions

In Zone 4, start oregano seeds indoors around Mar 15 – Apr 1, then transplant outdoors May 1 – May 20 after your last frost around May 1. Perennial. Established plants spread to form large clumps. Divide every 3 years.
Zone 4 has an average last spring frost of approximately May 1 and a first fall frost around Oct 1. These dates vary by specific location — use your ZIP code in the plant app for precision based on the nearest NOAA weather station.
Good companion crops for oregano include Tomatoes, Peppers, Beans, Brassicas. Avoid planting near Basil, Mint, which can compete for nutrients or attract pests.
Oregano typically takes 60–90 days from transplant or direct sow to harvest in Zone 4. Expected harvest window: May – Oct.

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Oregano in other zones
Crop Guides