Home GardenTips & How To When To Start Hollyhock Seeds Indoors

When To Start Hollyhock Seeds Indoors

by a Friendly Gardener
Hollyhock flower plant malvaceae

Hollyhocks are a treat to the eyes with their big beautiful flowers. It is only natural for you to want one for your indoor plant collection or for your garden. You can either get a plant from a nursery, or you can grow your hollyhocks from seeds by yourself.

Here is all you need to know about hollyhocks to grow them from seeds.


What Is Hollyhock?

Alcea rosea is the scientific name of this ornamental dicot flowering plant. It belongs to the hibiscus or mallow family (Malvaceae). This family of plants has 1,500 different species, out of which twenty-seven are found across North America.

Although it is seen worldwide, this plant is native to China and the area around the Eastern Mediterranean Sea. It was imported to Europe during the 15th century or possibly even before that.

The name “hollyhock” comes from “holyoke”–a name that was given to this species by a herbalist of the time called William Turner. It has been considered an emollient and a laxative in herbal medicine.

In herbal medicine, it is used to control inflammation and to stop bedwetting. To prevent bleeding from gums, it is prescribed to be used as a mouthwash.

This plant is widely cultivated and has several varieties. Some varieties are annual, some are biennial, and some are perennial. Some new varieties are also disease resistant.

Yellow hollyhock flower

The beautiful flowers of hollyhock are on the large side measuring 5 inches across each. They grow along the upper portion of the stem. The flowers are known to attract butterflies and hummingbirds.

The leaves of the hollyhock are large and heart-shaped. Each leaf has five to seven lobes. The plant is also on the taller side, growing up to 5–9 feet tall.

There are different colors of hollyhock flowers to grow, ranging from light shades of white, yellow, and orange to darker shades of pink and dark red. The different flowers prefer different kinds of soils. The darker flowers want sandy soils and the lighter ones prefer clay soils.

These plants reseed easily and are even considered invasive species in some regions outside their native growth.

Hollyhocks are hardy enough within the USDA hardiness zones 3 and 8. In areas with severe winters, they need more care and protection, although they can handle a little cold. In areas with permafrost, it is advised to plant them in a container and not outdoors.

These plants don’t do well in scorching temperatures either. If the temperature stays around 90 degrees Fahrenheit, they would not grow. They need protection from extreme weather and severe hurricanes and rainstorms.


When to Plant Hollyhock?

Hands covered in earth soil in home garden

To grow hollyhocks from seeds, you need to know when to start hollyhock seeds indoors. It takes about nine weeks from sowing seeds indoors to transplanting seedlings outdoors.


  • To plant your seedlings in spring, you should start your seeds indoors 9 weeks before the last predicted frost in your area.


  • You can also start hollyhock seeds in fall, 4–5 weeks before the first frost.


How to Plant Hollyhock?

Hollyhock flowers

Before sowing, water treatment of hollyhock seeds is common as the seeds are large and have fairly tough seed coats. This is done to soften the seed casing, break the dormancy of the embryo inside, and encourage germination.

Store-bought seeds or seeds that are collected, dried, and stored can be given a water treatment. You can soak them in warm water (113 degrees Fahrenheit) for up to 12 hours and in hot water (60-70 degrees Fahrenheit) for 30 minutes before sowing. It increases the chances of the seeds germinating and helps in faster sprouting.

It is not necessary to do so if you are breaking and scattering the seed pods outdoors at the end of the growing season.


  • Since hollyhock roots do not transplant well, it is suggested to use paper peats to sow your seeds in, so you can plant the entire thing in soil without disturbing the roots. You can also use other biodegradable materials.


The pods should also be at least 3 inches deep as the roots tend to grow long. There should also be holes at the bottom to facilitate proper drainage.


  • Fill the peats with seed-starting mix with a little sand mixed in (if you are growing a dark-colored flower) and water it. Wait for the water to drain completely till the soil is only moist.


  • Sow the seeds ¼ inch deep into the soil and cover the tray lightly as the seed will need a lot of light to germinate.


If you are growing two seeds on one pod, space the seeds by at least 6 inches.


  • Cover the tray on which you are keeping your seed pods with a plastic cover and poke some holes in it.


  • Keep the tray in a sunny spot in your house so it can get enough sunlight. If you do not get enough sun, keep the tray under grow lights.


  • Keep the soil moist till the seeds germinate. Make sure the soil is not wet or soggy.


  • The seeds should start to germinate between 1–2 weeks. Before you transplant it outdoors wait for a couple of leaves to start growing.


Remember to harden off your seedlings before planting them outdoors.


Where to Plant Hollyhock?

Hollyhock seeds

Your seedlings would be ready to be planted as soon as they are hardened off. It is better to transplant them before their roots get too long.


  • The soil bed in which you plant your seedlings should be fertile, well-composted, and well-draining or water-retaining (as the variety of your plant needs).


  • The location should be sunny. These plants grow well in partial shade too, but they should get a minimum of 6 hours of sun per day. The more the sun, the bigger the bloom.


  • Plant them at least two feet apart from one another.


  • Add a two-inch layer of organic mulch around each seedling.


  • Water the plant well. Keep the soil moist the first few weeks after planting. But pay attention so that the soil does not get waterlogged.


  • Each spring, add some more compost to the plant bed.


  • As the plants grow taller, tie the tall stalks to a trellis to support them.


How to Deal with Pests and Diseases?

Seedlings are prone to attacks from slugs and snails. Japanese beetles and spider mites frequently attack them. It is advised to keep a close watch so they do not get eaten.

The leaves of hollyhocks are prone to attacks from rust (Puccinia malcacearum). Spray fungicides to deal with this. The leaves are also prone to attacks by leaf spots and anthracnose.

Usually, the flowers are not affected by these attacks although the leaves have a rough time.

There are disease-resistant varieties available to plant—you should get those. And if one of your plants falls prey to disease, completely remove it from the vicinity of other plants and destroy it.

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