Tips For Growing Beautiful Althea Plants

  • By: Succulents Plants
  • Date: December 5, 2022
  • Time to read: 8 min.
Althea Plant
Photo by the courtesy of Twinschoice

The Althea plant is an excellent addition to any garden with its vibrant flowers, fragrant aroma, and easy care instructions. In this article, we will give you tips for growing beautiful Althea plants so that you can create a stunning display in your garden.


What is an Althea Plant?

An Althea plant, also known as a Rose of Sharon, is an upright shrub that blooms with vibrant and colorful flowers during summer. It’s a popular choice to add color to gardens and landscapes, as it has a wide variety of uses and is relatively easy to care for.

Native to the Mediterranean region, the Althea is a deciduous shrub and has a moderate growth rate. It can reach up to 10 feet in both height and width, making it an ideal choice for many medium-sized gardens and landscapes. Its leaves are dark green, oval-shaped and have toothed margins.

The large and abundant blooms of the Althea consist of five petals in a wide range of colors including white, pink, red, and purple. These attractive blooms appear in early to mid-summer and can last for up to two months. The Althea plant’s long flowering period makes it ideal for gardeners hoping to keep their garden looking alive and colorful all summer long.

When it comes to care, the Althea is relatively easy to maintain. It prefers full sun and well-drained soil, and it’s important to water it during the hottest summer regularly. Pruning is generally unnecessary, but it can help control the shrub’s size and shape. The Althea is also relatively pest and disease-resistant, making it an ideal choice for novice gardeners.


Planting and Care of Althea

Planting and caring for Altheas can seem intimidating, but with a little bit of knowledge you can be a successful althea grower! Althea plants are drought-tolerant and prefer full sun exposure, though they can handle some partial shade. When planting althea, ensure the soil is well-draining and well-aerated. If need be, you can amend the soil with a mixture of sand, organic compost, and other soil amendments.


How to Plant Althea

The first step to planting your Altheas is to decide on the location. Altheas thrive in sunny spots with well-drained soil, so make sure to find a spot that gets plenty of sunlight and has soil that drains well. The soil should be amended with compost or fertilizer to ensure the Altheas will receive the necessary nutrients.

When you’re ready to plant, dig a hole that is twice the size of the Althea’s root ball. Place the plant in the hole, fill it with dirt, and gently pat down the dirt around it. Water the plant thoroughly after planting and mulch the area to help retain moisture.

Althea plants should be watered consistently and fertilized every two to three weeks to help them thrive. Prune the plants regularly to keep them healthy and encourage new growth. Deadheading the spent blooms will also help promote blooming. Your Althea plants will be a beautiful addition to any garden with proper care.


Location and Sunlight

Althea plants thrive in full sunlight, so placing them in an area that receives full sun for at least six hours a day is best. By having a sunny location, your althea plants will have the right amount of light to flourish.

If your althea plants are in a partially shaded area, then they may not get enough light to grow properly. Althea plants can also tolerate partial shade, but they will not bloom as well as they would in a sunny location. If you find that your althea plants are not getting enough sun, try moving them to a sunnier spot.

Another factor to consider when it comes to sunlight and althea plants is the heat. Althea plants can handle higher temperatures as long as they have proper ventilation. If your althea plants are in an area with poor air circulation, then it can cause them to suffer from heat stress. Ensure your althea plants have enough airflow to keep them from getting too hot.

Finally, you should check your althea plants periodically for signs of stress. If your plants are wilting, have discolored leaves, or show any other signs of stress, then you should take steps to address the issue. You can ensure that your plants stay healthy and beautiful by providing your althea plants with the right amount of sunlight, heat, and air circulation.


Watering Althea

The key to successful watering is to allow the soil to dry out completely between waterings. Althea does not like being too wet and could be damaged if left in standing water for too long. Additionally, over-watering can lead to root rot, so it is important to be mindful of the amount of water used.

The best way to water an althea plant is to apply a few inches of water directly to the soil from the top and let it soak in. If it drips from the bottom of the pot, then you know the soil is saturated. Once the soil is saturated, it is important to hold off on the next watering until it is dry. Check the soil’s moisture content by feeling it with your fingers. If it is dry to the touch, then it is time to water again.

In dry climates, althea plants may need to be watered more frequently due to the lack of humidity. In this case, it is best to use a spray bottle to mist the leaves and provide some extra moisture. However, do not overwater as this can cause issues with root rot.


Fertilizing Althea Plants

Fertilizing your althea plants is important to ensure they grow to be big, beautiful, healthy plants. Altheas are very adaptable and can grow in many different soils, but they will benefit from regular fertilizing to meet their nutrient needs.

Organic fertilizers are a great choice for altheas, as they will provide slow-release nutrients directly to the plants. Manure, compost, and fish emulsion are all excellent options to help your althea plants thrive. Alternatively, you can use a slow-release fertilizer or water-soluble fertilizer with a balanced NPK ratio.

When fertilizing your althea plants, be sure to follow the application instructions on the packaging. Too much fertilizer can damage their roots and prevent them from getting the needed oxygen and water. To avoid this, you can mix the fertilizer at half strength and apply it every three to four weeks.

You can also use soil amendments such as gypsum or sulfur to help your althea plants grow strong and healthy. These amendments will improve the soil structure, improve drainage, and provide additional nutrients for your plants. Adding a layer of mulch around your altheas can also help to retain moisture and keep weeds from competing with the plants for nutrients.


Pruning Althea

The best time to prune your althea plants is during the early spring, just before they enter their blooming period. Start by pruning off any dead or diseased branches, as well as any shoots that are growing too close together. To encourage bushier growth, you can also trim away any wayward stems or branches.

You should always use sharp, clean scissors or shears when pruning althea to get the job done right. Make sure to clean your pruning tools both before and after each use in order to prevent spreading any diseases.

You may also need to remove some of the older woody branches for althea plants that have been in the ground for a while. This will allow for new growth and may even result in larger blooms. When pruning, it is extremely important to make clean, angled cuts just above the node. This will ensure that the plant is able to heal properly and continue to thrive.


Common Problems with Althea Plants

1. Poor Drainage:

Althea plants require good drainage to thrive. If your soil does not have good drainage, your plants may become waterlogged and wilting. Ensure adequate drainage for your Althea plants by using a potting mix that includes organic and inorganic components, such as perlite, or providing large drainage holes in the bottom of your pots.

2. Pest Infestations:

Althea plants are prone to a few common pests, such as aphids, mealybugs, and scale. The best way to combat these pests is to inspect your plants regularly and treat them with an organic insecticidal soap or horticultural oil.

3. Lack of nutrients:

Althea plants require a balanced diet of essential nutrients to thrive. To ensure your plant receives the nutrients it needs, fertilize regularly with a balanced fertilizer such as a 10-10-10 or 20-20-20.

4. Too much sunlight:

Althea plants require plenty of sun to flourish, but they can suffer from sunburn if they receive too much. To protect your plants from sunburn, move them to a spot with partial shade during the hottest part of the day.


Harvesting and Drying Althea Seeds

When your Althea plant is in full bloom, it’s time to harvest and dry the Althea seeds. Start by gently shaking the flowering heads of your Althea plant to release the seeds from the pods. Keep in mind that the seeds you collect should be brown and hard. If the seeds are soft and whitish, they are not ready to be harvested.

Once your seeds are gathered, spread them out in a single layer on a cloth or paper towel and allow them to dry for several days. Make sure to spread the seeds out so that they don’t touch one another as they dry. Once the seeds are completely dry, they can be stored in an airtight container.

When you are ready to plant the Althea seeds, soak them overnight in lukewarm water. This will help the seeds to germinate quicker. Once the seeds are hydrated, they can be planted in well-drained soil and kept moist until they sprout.

Harvesting and drying Althea seeds is a rewarding experience that will result in a stunning show of beautiful flowers in the garden. Enjoy!


In conclusion, growing Althea plants is quite a rewarding experience. With the proper care, an Althea plant can yield beautiful blooms from late spring to late summer and may even reward the gardener with Althea seeds. Although they are fairly low-maintenance, Althea plants require specific instructions, including location, sunlight, watering and fertilizing. Pruning may also be necessary to keep the plant healthy and vibrant. Additionally, common problems with Althea plants may present themselves but can usually be solved carefully. If you are willing to do the work, you can have a beautiful Althea plant in your garden that you can enjoy for years to come.


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