Greenhouse Gardening - How to Grow Oregano?

Greenhouse Gardening - How to Grow Oregano?

April 27, 2017

Oregano or wild marjoram is an aromatic herb of the mint family. It has soft, olive-green spade-shaped leaves that are a great source of Vitamins A, B6, C, E, and K as well as magnesium, iron, calcium, and potassium. The herb that is native to the Mediterranean region and southwestern Eurasia is easy to grow in any greenhouse. Here is how:


  • You can grow oregano from seeds or use cuttings from mature plants. Plant the seeds or cuttings anytime about five to ten weeks ahead of the last spring frost.
  • Plant the seeds or cuttings in moderately rich, well-drained soil. Suitable soil temperature in the greenhouse should be about 70 degrees Fahrenheit and the preferred spacing between 8 and 10 inches apart in rows that are about 20 inches apart.
  • When the plants attain a height of 4 inches, pinch the bud or trim the plant lightly. This encourages the oregano plants to get denser or grow bushier. 

Tips and tricks

  • Trimming the buds not only encourages bushier plants, it also prevents the plants from getting leggy, a situation characterized by too much foliage than the root and stem system can support. 

Common problems

  • Some common pests and diseases that attack oregano plants are spider mites, aphids and root and stem rot.

Watering requirements

  • In your greenhouse, and even out in the open, oregano requires comparatively less water than most herbs. Water the plants when the ground feels dry to your touch. The appropriate amount is two to three gallons per plant every fortnight. 

Soil requirements

  • Oregano thrives in moderately fertile, well-drained neutral to slightly alkaline soils with pH ranging from 6.0 to 7.2.

Lighting requirements

  • The herb requires plenty of sunlight. However, it can thrive indoors especially if you place your greenhouse kit in a location with lots of sun exposure that allow the plants to receive adequate sunshine and heat. 


To enjoy the full flavor of oregano, harvest the leaves just before the plants start to flower. Harvest by cutting branches slightly above the joint with the stem.

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Oregano plant and dried herb with the text: How to grow oregano in a greenhouse

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