Greenhouse Gardening - How to Grow Rosemary?

Greenhouse Gardening - How to Grow Rosemary?

April 27, 2017

Rosemary is one of those astonishing herbs that presents a lovely decorative plant and a delightful culinary spice. It is a member of the mint species. Rosemary is a triple feast herb. It is ornamental, aromatic, and flavorful. Its leaves and flowers are tasty. Grow them easily in your greenhouse and just cut off portions of the stem whenever you want it. It can be trimmed to reveal a more charming, compact addition in your garden.

The three basics for successfully growing rosemary are the sun, excellent drainage, and good airflow. You do not require comprehensive sunlight, sea spray or a never-ending summer to successfully plant them. It is considered easy to plant in a greenhouse particularly for novice gardeners. Simply let them sit there and appreciate the fragrance and view.

Grown rosemary with flower

Added benefits of rosemary

Rosemary, which is native to the Mediterranean region, is a woody perennial herb that has a distinctive fragrance, evergreen needle-like leaves, and pink, purple, white or blue flowers. The herb is common in lamb and poultry recipes as well as soups and stews. Now would you believe that it is likewise considered to support memory retention?

It is surprisingly simple to grow Rosemary in a greenhouse. Here’s how:


  • You can start rosemary from either seeds or cuttings. You should plant these about ten weeks ahead of the last spring frost.
  • It is advisable to soak the seeds for four to six hours before planting to soften the seed coat and prime them to sprout.
  • The herb does well in well-drained soils with temperatures ranging from 65°F to 75°F
  • Preferred spacing: 3ft by 3ft
  • It is important to trim the plants after the first flowering. This encourages the plants to grow bushier.
  • Because rosemary loves it on the dry side, a terra cotta pot is an excellent choice.

Rosemary know-how

  • Gardeners who prefer cuttings to seeds should dip the bottom of every cutting in a hormone rooting powder to encourage the cuttings to take root. Note that cuttings are preferred since they grow into better plants compared to those started from seeds.
  • Rosemary plants require considerably less water during winter. During these cold months, only half the usual water is required, which is a gallon per plant every fortnight.

Common obstacles

Rosemary is susceptible to several common diseases. Some of them are spider mites and aphids. These bugs appear to exist on houseplants in wintertime. Grabbing them before an entire invasion will make them easier to manage. Continuous sprinkling with insecticidal soap will take care of this difficulty.

Powdery mildew is a white, dusty fungus that can progress if the neighboring air is wet and there is no sufficient air flow. It will not ruin your rosemary, but it will make it weak. Keep a low moisture level by letting the water to evaporate slightly between waterings, putting them in daylight and, if needed, having a fan for several hours every day to generate a breeze.

Watering duties

Rosemary requires moderate watering. Water weekly with one gallon per plant. If you plant the herb in pots then ensure it has excellent drainage since standing water may encourage root rot.

Planted rosemary in a pot with a sprinkler on the left side

They can stand dry soil and drought. They do not need water throughout droughts but you can still water them if they seem to wilt.

Best soil conditions

Rosemary will do great in about any soil. They normally do not expect compost, except for pot grown seedlings.

Root and crown rot pathogens are worsened by planting them extremely deep and by overwatering. Sufficient airflow will decrease the rate of foliar conditions. The herb thrives in well-drained, slightly rich, neutral to alkaline soil with pH ranging from 6.0 to 7.0.

Check out these planters for providing the best environment for your rosemary!

Temperature and lighting demands

Rosemary prefers full sun but can tolerate partial shade. Ensure you set up your greenhouse kit in a manner that will allow the plants to have six or more hours of light each day. They can also thrive in full daylight and can endure greenhouse temperatures of at least 120°F. A lightly shaded greenhouse is okay throughout summer.


Rosemary can be cut anytime about 85 days after germination. For smaller portions, the top part can be cut with a clip. Larger quantities can be harvested by cutting the stem to within two to three nodes of the main woody support.

Start growing your aromatic rosemary today!

Are you thirsty for more? Learn how to grow more greenhouse plants easily here! Give us a note below about your greenhouse progresses. We are excited to speak to you soon!

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    Rosemary plants with the text: How to grow rosemary in a greenhouse

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