How to Grow and Care for Marsh Mallow Plant

The marsh mallow plant is a tall perennial plant beloved for its hibiscus-like flowers. The roots and leaves of the plant contain mucilage, a substance that when mixed with water forms a thick gel. Marsh mallow was used for medicinal purposes and the ancient Egyptians started the sweet treat that became today’s marshmallows (which no longer contain any trace of the plant).The flowers are loved by pollinators. Brown seed pods begin to form in late September, releasing tiny black seeds when mature.

Depending on your climate, marsh mallow is planted from seed in the fall or spring.

Marsh Mallow Plant Care

The plant is easy to care for and an excellent option for wet, marsh-like areas. Here are the main care requirements for growing a marsh mallow plant:

• Plant marsh mallow in a location with full sun and moist or wet soil with good drainage.
• Make sure the soil is consistently moist and water accordingly.
• Add a 2-inch layer of mulch around the plants and keep the area free of weeds until the plants are tall and established.
• There is no need to fertilize marsh mallow.
• Deadhead spent flowers and remove any dead leaves during the growing season.

Light

Marsh mallow plants need full sun, they do not do well in the shade. Be careful not to plant them in a location where taller plants will cast shade on them.

Soil

True to its name, the marsh mallow plant likes marshy, wet areas. An area with consistently damp soil with a slightly acidic pH around 6.0 is ideal. Don't worry too much about achieving acidic soil conditions, though, as these plants are not fussy about soil pH levels.

Water

Consistent moisture with good drainage is essential for marsh mallow plants. If your soil is sandy, add moisture-retaining soil amendments such as organic matter. Standing water, on the other hand, is too wet for the plants.

Temperature and Humidity

Marsh mallows are tough plants that thrive in a variety of different climates and humidity levels. They are extremely cold tolerant although, during sub-freezing temperatures, they will die back and will emerge again in the spring. They have no particular humidity preferences or dislikes.

Fertilizer

Marsh mallow plants grow in such a wide range of soils (they even tolerate soil with a high saline content), that applying a special kind of fertilizer isn't really necessary, especially if you have already added organic matter to the soil.

Pruning

It's not strictly necessary to prune marsh mallow plants but it improves the appearance of the plant to deadhead spent flowers and remove any dead leaves. This also makes the plant less inviting to pests.

Propagating Marsh Mallow

Marsh mallows are easy to propagate by root division:

1. Wait for the plant to go dormant in the late fall or early winter before the ground freezes.
2. Dig up the plant with its entire root system.
3. Divide the root mass into smaller sections using a sharp spade.
4. Replant the sections in a new suitable location at the same depth as the original plant.

Propagation by division can also be carried out in the early spring before foliage has begun to sprout although, because the plants die back in the winter, it could be difficult to locate them before they break their winter dormancy.

How to Grow Marsh Mallow Plants From Seeds

Marsh mallow plants are easy to start from seed, directly in the ground in the late fall if your area has mild winters or in the early spring if your winters are cold. The seeds germinate better if they go through eight to 12 weeks of cold stratification at 33 to 41 degrees F before planting.

1. If you don’t plant the seeds in the fall (nature takes care of the stratification), place the seeds in the refrigerator in a plastic bag with some lightly moistened peat moss.
2. After the cold stratification period, start the seeds indoors three to four weeks before the last frost date, or sow them outdoors once the danger of frost has passed.
3. Sow them in groups of five or six seeds spacing them 18 to 24 inches apart.
4. Lightly cover the seeds with soil, and keep them moist until they germinate. Germination usually takes about three to four weeks.
5. If you started the seeds indoors, transplant the seedlings outside inmid- to late spring after hardening them off.

Potting and Repotting Marsh Mallow

Growing marsh mallows in containers is not recommended as the plant needs consistently moist soil, which is difficult to maintain because container plants dry out much faster than garden soil.

Overwintering

As marsh mallow is extremely cold tolerant and dies back in the winter months, there is no need to take any special precautions for overwintering. It is, however, always a good idea to cut away any dead stems or leaves to keep your garden tidy and increase airflow around the plants when they re-emerge in the spring.

Common Pests & Plant Diseases

Even though nearly all parts of the marsh mallow plant are edible, it is mostly left alone by pests. One invader that might decide to feast on your marsh mallows, however, are flea beetles, which lay their eggs near the plant's roots. The larveae first feed on the roots, then on the leaves, leaving pinprick-sized holes. If the problem arises, apply neem oil.

Marsh mallows are quite disease-resistant, except for rust, a fungal disease that appears as raised white dots on the underside of leaves. The affected areas eventually turn orange, then yellowish-green, and finally black. If you see this condition, remove any affected leaves and avoid overhead watering. In severe cases, apply a copper-based fungicide designed to treat rust.

How to Get Marsh Mallow to Bloom

Bloom Months

Marsh mallow blooms from July to September.

How Long Does Marsh Mallow Bloom?

Individual blooms are short-lived but the plant produces flowers all summer long until fall.

What Do Marsh Mallow Flowers Look and Smell Like?

The bloom is visually striking but the flowers are not fragrant. The tall, elegant spikes are covered with almost white to blush or light pink flowers.

How to Encourage More Blooms

If your marsh mallow plant fails to bloom profusely, the reason is most likely lack of sun. Move it to a location where it receives full sun, six to eight hours per day. You could also prune surrounding plants that cast shade on it to let in more sunlight.

Caring for Marsh Mallow After It Blooms

Remove spent flowers and dead leaves to prevent the plants from attracting unwanted pests.

From: thespruce