Cottage Garden Plant: Marshmallow ⋆ SomeTyme Place

Cottage Garden Plant: Marshmallow. July 28, 2026.

The Marshmallow plant has a wispy beauty with pale pink, papery blooms that remind me of Sweet Peas. Its flowers are much paler and more subdued than those of its cousin, the Hollyhock. And like its cousin, this pretty herbaceous plant has a wholesomeness to it, offering an old-fashioned and nostalgic backdrop that rounds out the cottage garden nicely. Marshmallows can get quite tall- up to seven feet. Mine aren’t tall, but they are young and flourishing, so I am not concerned about their location. How easily they reseed in our yard will be telling. My friend’s marshmallows are all too pleased to populate her garden, an indicator of their happiness.

Marshmallow plants are worth adding for their roots, which have long been prized throughout history for their mucilage. That mucilaginous root has provided us with delicious marshmallows as well as soothing herbal treatments for throats, stomachs, and more. It has risen quickly to being one of my favorite herbs for soothing acid reflux or a scratchy throat- especially when combined with licorice. Marshmallow root is a cooling and moist herb that is helpful for digestion issues. When my stomach or throat is irritated, I drink this tea for a few days to calm things down. Incidentally, you should wait to harvest roots when the plant is about 3 years old. I still have one more year to go.

Like the Hollyhock, the Marshmallow has a tall main stem from which smaller, flower-bearing stems protrude. Its native habitat is in marshlands and coastal areas, but it is also happy in the garden. Marshmallow seeds can be direct-sown, but they will need a period of cold to stratify. Either sow them in the fall and wait for Spring, or put a pack of seeds in the refrigerator for a couple of weeks, then plant. I have done both ways, and they both took a while to germinate. So far, I have not seen any of that ghastly fungus the mallow family tends to struggle with. If you are a home herbalist, the Marshmallow is one to add to your herb garden.

Plant Profile

Description: This pretty cousin of the hollyhock is worth considering for the cottage garden, especially if you are a home herbalist.
Type: Perennial
Botanical Name: Althaea officinalis
Common Name: Marshmallow
Family: Malvaceae
Garden Zones: 3-9
Soil Preference: Prefers damp, well-draining soil.
Light Needs: Full sun
Water Needs: Average
Height/Width: Up to 7 ft high; 2 – 4 ft spread.
When to Plant: Sow seeds in fall or stratify in the fridge for a few weeks before planting in Spring.
How to Plant: Sow seeds in damp soil prepared with organic matter/compost. Allow for space between plants to avoid fungus.
Blooming Period: Mid-summer to early fall
Propagating: Seed or division.
When to Harvest: Harvest new leaves and flowers in summer for herbal preparations. Flowers can also be used as an edible in salads. In the Fall, harvest roots for herbal preparations from plants that are at least 3 years old.
Maintenance: Minimal, but it is prone to rust like the Hollyhock, so water at the base and remove infected leaves.
Companion Plants: Use as a background flower in herbaceous borders.
Uses: Attracts butterflies and birds. Its roots and leaves are a wonderful addition to the home apothecary for their skin-soothing properties both inside and out.
Personal notes: Considered a good substitute for slippery elm in herbal preparations.