Origanum Plant Growing & Care Guide for Gardeners
Article by Dean Ravenscroft, Ph.D. - Updated 23rd Oct 2023
In this Gardener's HQ guide, we'll explore cultivating Origanum plants in your garden, indoor spaces, and other settings.
- Plant Characteristics: Origanum plants boast aromatic leaves and petite flowers. Their fragrant foliage is not only a culinary delight, but is also a magnet for bringing pollinators to gardens.
- Ideal Growing Conditions: TPlants thrive in full sun and require a soil that has good drainage. They are drought-tolerant once established, making them ideal for xeriscaping.
- General Care: Regular pruning can both stimulate new growth and prevent them from becoming woody. Avoid over-watering so as to prevent root rot.
- Tips for New Gardeners: Oregano and Marjoram are beginner-friendly, resilient plants. For the best flavor, be sure to harvest leaves before the plant flowers.
Oregano, and Marjoram: Cultivation & Garden Use
Origanum plants are popular herbs that are often used in the kitchen. Depending on the species they can be hardy perennial, or half hardy perennials; but are often grown in the garden as half hardy annuals.
Origanum reach from 15 to 45 cm (6 to 18 inches) in height and bear pink tubular flowers in the Summer.
Some common names for Origanum include Oregano (Origanum vulgare), Sweet Marjoram (Origanum majorana), Annual Marjoram, and Marjoram.
These plants make ideal additions to an herb garden, but are also useful in rockeries. If you require the Origanum leaves for cooking then they should be harvested before flowering occurs.
Unlike many herbs which are best used fresh, drying the Origanum leaves often leads to a more intense flavor. To dry Oregano leaves place in a warm and dark place. In addition to use in cooking, the oil of oregano is also thought to have many health benefits.
Origanum vulgare – Oregano by Anemoneprojectors; creative commons.
How to Grow Origanum - Oregano and Sweet Marjoram in Your Garden
It growing oregano outdoors from seeds then it is best to sow the Oregano seeds (Sweet Marjoram and other Origanum species) in mid spring, well past any chance of a frost.
Once sown, the seeds should be lightly covered with soil. Oregano likes to grow in a sunny area of the garden and requires good drainage. Ideally the soil should be of pH 6 to 8.
When starting Oregano indoors, sow the seeds at about 12 to 18 degrees Centigrade (54 to 64°F). It should take about one to two weeks for the oregano seeds to germinate.
Plant oregano outdoors with a spacing of about 20 to 30 cm (8 to 12 inches) apart. Doing this following the last frost of spring should give best results.
Caring for Origanum Oregano
Oregano, Sweet Marjoram and other Origanum members are easy to grow and care for.
Once they are growing healthily, it is best to pinch the young plants back. This will encourage more branching and lead to a bigger harvest.
It is also necessary to fertilize Oregano plants for best results.
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Origanum Growing and Care Guide
Common Names: Oregano, Marjoram: Sweet; Knotted; Italian; Pot; Wild; Hop; Greek; Flowering; Winter.Life Cycle: Hardy perennial, half hardy perennial commonly grown as a half hardy annual by gardeners.
Height: 8 to 30 inches (20 to 80 cm).
Native: Mediterranean, East Asia.
Growing Region: Zones 2 to 9. As a perennial in zones 4 to 9.
Flowers: Summer.
Flower Details: Purple, pink. Tiny. Spikes
Foliage: Glossy green. Dark to pale green. Grayish. Ovate. Rounded. Sometimes hairy. Aromatic.
Sow Outside: Cover seed. A few weeks after the last frost; temperature should not drop below 46°F (8°C). Spacing 6 to 24 inches (15 to 60 cm).
Sow Inside: Germination time: one to two weeks. Temperature 60°F (15°C). Seven or eight weeks in advance. Transplant outdoors a few weeks after the last frost.
Requirements: Full sunlight. Good drainage. Soil pH 6 to 8.5. Can survive in dry soils. Pinch tips. Spring feed. Harvest stems before flowering occurs. Propagate: dividing or cuttings in the spring.
Family: Lamiaceae.
Miscellaneous: Some species are known to spread so you may want to grow in a pot or as part of a confined herb garden.
Common Questions
How many members does the Origanum genus contain?
The Origanum genus contains about 50 species, including the well-known culinary herbs Oregano and Marjoram.
Do Origanum members make a good garden or landscaping plant?
Yes, Origanum species make excellent additions to herb or kitchen gardens. They are also useful for attracting pollinators to the garden. They release a lovely fragrance when brushed against or crushed.
Which Origanum species are most frequently grown by gardeners?
The most commonly grown species are Oregano (Origanum vulgare) and Sweet Marjoram (Origanum majorana) due to their culinary use.
Are Origanum plants fragrant?
Origanum plants, especially Oregano and Marjoram, have a strong, pleasant fragrance; this is released when the leaves are crushed.
What is the perfect location to grow Origanum?
Origanum prefers full sun and well-drained soil. It's a drought-tolerant genus, making it suitable for xeriscaping or rock gardens.
Is Origanum invasive in the USA, if so in which states?
Currently, Origanum species are not considered invasive in the USA. They are typically well-contained in herb gardens as they are a widely used culinary herb.
How do I remove Origanum plants from my garden?
Origanum can be removed by digging up the plant, ensuring to get as much of the root system as possible. Regular pruning can also help to control its spread.
Summary
The Origanum genus, part of the Lamiaceae family, consists of aromatic perennials and subshrubs, widely known as oregano. Besides their culinary use, they offer clusters of small, usually purple or pink flowers.
Origanum requires a sunny location with well-drained soil and good air circulation. Planting is typically done in spring. With their fragrant leaves and appealing flowers, they make a delightful addition to herb gardens, borders, or rock gardens.
I hope that you enjoyed this guide on how to grow Origanum plants. You may also enjoy the following Gardener's HQ growing guides: How to grow Melissa, Salvia, and Ocimum plants.
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