Rosemary Plant Care: The Ultimate Guide

  • By: Succulents Plants
  • Date: December 16, 2022
  • Time to read: 7 min.
Rosemary Plant
Photo by courtesy of Yuliia Chyzhevska

Are you looking for the perfect way to add an aromatic and unique flavor to your meals? You’d be glad to know that the rosemary plant would be an excellent addition to your herb garden. Take a look at this ultimate guide on rosemary plant care and learn the tips and tricks you need to know to grow this plant successfully.

Choosing the Right Rosemary Plant

Rosemary is a frost-tolerant evergreen that can do well in cooler climates and gardens in warm climates. Your area’s hardiness zone can give you a good idea of what type of rosemary plant is most suitable for you.

Rosemary is available in various shapes and sizes, from compact, shrubby plants, to low ground covers and tall, upright shrubs. Knowing the size and shape of the area, you’re looking to fill will help you narrow down the right size and shape of rosemary for your garden.

Rosemary comes in various shades, from light green to dark blue. The color of the plant you choose will be essential in creating the design aesthetic you’re looking for in your garden.

When considering the rosemary plant’s size, shape, and color, it’s also essential to consider the type of care it will need. Rosemary is a relatively low-maintenance plant, but it does benefit from regular pruning and trimming to keep it looking its best. Additionally, rosemary plants require well-drained soil, so be sure to research the best soil type for your rosemary plant before planting.

Sunlight Requirements

Rosemary plants require lots of sunlight to thrive, making them ideal for outdoor gardens or balconies. The sunlight determines how much the rosemary plant will grow, which triggers its growth. Regarding sunlight requirements, rosemary plants prefer full sun, meaning at least 8 hours of full or partial sunlight per day. This means that the best place to place rosemary would be a spot that gets direct sunlight in the morning and later in the day. If the rosemary plant is not getting enough sunlight, its growth will be stunted, and the leaves may become pale in color.

For indoor plants, it’s best to place them near a sunny window if possible. You can always supplement the sunlight with a grow light if the window isn’t getting enough light. Be sure to move the rosemary plant away from the light source so it won’t be too close to the heat. Rosemary in containers will also require more water than those planted in the ground, so be sure to check the soil frequently to ensure it is not becoming too dry.

Soil Type

The soil needs to be well draining and have a neutral pH of about 6.5-7.0 for the best results. It’s best to use soil specifically for growing herbs, as it will provide the best growing environment for rosemary. If you use a regular potting mix, add some compost or peat moss to increase the drainage.

If your rosemary plants are in containers, remember to repot them every other year. Rosemary plants don’t like being kept in the same container for extended periods. When you report, use fresh soil and the same guidelines for the soil type mentioned above.

Some soils can be too rich for rosemary. Manure-based soil or soils high in nitrogen can overwhelm a rosemary plant, so it’s also best to avoid these soils.

Humidity Level

The ideal humidity level should be around 50%. If your home or garden has an average humidity level of 40-50%, your rosemary plants should be delicate. However, humidity levels above 70% can cause rosemary leaves to lose their flavor and color, so be sure to maintain a moderate humidity level for your rosemary plants.

If your home or garden is arid, consider a few methods for increasing the humidity level of your rosemary plants. A great option is to mist the leaves of your rosemary plants with water once or twice a day. You can also place a tray filled with stones and water near your rosemary plants to increase the humidity in the air. Another great way to increase the humidity around your rosemary plants is to group plants. This will help to create a greenhouse effect, leading to higher humidity levels.

Rosemary Plant Care

Rosemary plants are easy-to-care-for perennials growing in a variety of climates. Whether you grow your rosemary in a container or garden, it’s essential to understand the basics of rosemary plant care. You can ensure that your rosemary plant is healthy and vibrant with a few simple steps.


Rosemary plants do best with infrequent, deep watering. Aim to water your rosemary deeply once a week. When you water, saturate the soil completely and be sure to continue watering until the soil is completely saturated, allowing the water to run through the drainage holes at the bottom of the pot. Then, allow the top inch or two of the soil to dry out before watering again.

Be sure to check the soil before every watering. If it’s still damp, you don’t need to water it yet. It’s also important to use room temperature water for your rosemary, as the cold water from the tap can shock the plant’s root system.


If your potting soil does not contain any fertilizer, you should add a balanced fertilizer once a month during the growing season. You can also use a liquid or slow-release fertilizer for your rosemary plant. Make sure to apply the fertilizer around the base of the plant and keep it away from the leaves and stems.

Rosemary plants need plenty of sunshine but also some fertilizer to thrive. When fertilizing your rosemary plant, it’s essential to use a balanced fertilizer, like a 10-10-10 ratio. This will provide the right balance of nitrogen, phosphorus, and potassium. Other fertilizers can be used, but it’s best to use a good-quality fertilizer with the right combination of nutrients for your rosemary plant.

It’s also essential to adjust the amount of fertilizer used each year. As the rosemary grows, it will require more fertilizer to keep it healthy. You can also add weak kelp, fish emulsion, or compost tea fertilizer to the soil every two weeks to ensure that your rosemary plant is getting enough nutrition.


Pruning helps to encourage healthy growth and new branches, as well as helps to maintain the shape of the rosemary. Pruning should be done regularly, usually twice a year in the spring and fall. When pruning, make sure you remove any dead, dry, or diseased branches and any branches that are too long or unruly.

It is essential to use sharp and clean pruning tools. Pruning shears are ideal for this task, though a sharp knife or bypass pruners can also be used. Avoid using scissors, as they can damage the branches.

Be sure to cut branches all the way back to the main stem. If the branch is thick, consider making two or three cuts instead of one to avoid damaging the stem. Prune each branch at a slight angle and avoid leaving stubs. Pruning reduces the size of the rosemary plant and encourages new growth.

When pruning, you may see woody areas inside the branches. This is normal; you can prune away these areas to promote new growth. Once the pruning is complete, clean your tools and give the rosemary plant a thorough watering. This will help to promote healthy regrowth.

Pests and Diseases to Look Out For

Aphids: These small insects often cluster on the leaves and stems of your rosemary plant and can cause severe defoliation and a decline in plant health. To reduce the risk of aphids, keep the leaves of your rosemary plant dry and mist them with insecticidal soap every few weeks.

Mites: Tiny mites can cause the yellowing of leaves and white, web-like deposits. Insecticidal soap or horticultural oils are the best treatments for mites.

Powdery Mildew: Look out for a white, powdery substance on the leaves of your rosemary plant, as this is a sign of powdery mildew. Practice good air circulation around the plant and avoid splashing water on the leaves to prevent it.

Root Rot: Rosemary plants are especially susceptible to root rot, so check the roots often for any signs of damage. To avoid rot, use appropriate potting soil and plant in containers with drainage holes.


The ultimate key to successful rosemary plant care is to know your plant’s needs and preferences and take the time to give it the care it needs. Finding the suitable soil, location, water, fertilizer regimen and knowing when to prune and how to combat pests and diseases will ensure your rosemary continues to thrive. And, of course, don’t forget to enjoy the wonderful aroma of your rosemary as a reward for all your hard work! With the proper care and maintenance, you’ll be able to nourish and nurture your rosemary, so it can give you joy and bountiful harvests for many years to come.


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