Everything you need to know about Hollyhock Seeds

Hollyhock Seeds Questions & Answers

When should hollyhock seeds be sown?
Hollyhock seeds should be sown in early spring after the danger of frost has passed. Alternatively, you can sow them in late summer or early fall for blooms the following year.

How long do hollyhocks take to grow from seed?
Hollyhock seeds germinate in 7-21 days and the plant will continue to grow, focusing on foliage growth and root development for the first year. Usually seed-grown hollyhocks will take until the following year to flower.

Does hollyhock come back every year?
Hollyhocks are usually biennial or short-lived perennial plants, meaning they typically live for two years or more. In their first year, hollyhocks will establish their foliage and root system. In the second year, they will produce their characteristic tall flower spikes. However, with favorable growing conditions, hollyhocks can self-seed and return year after year, creating a perennial presence in the garden.

Should hollyhock seeds be soaked before planting?
Some gardeners believe that soaking hollyhock seeds for a few hours or overnight can help soften the seed coat and potentially improve germination rates. If do you choose to soak the seeds, be sure not to soak them for too long, leading to seed damage or rotting. Soaking hollyhock seeds before planting is not necessary, as they generally germinate well without any pre-treatment.

What month is best to plant hollyhocks?
In most regions, hollyhock seeds can be planted in early spring after the danger of frost has passed. This timing allows the seeds to germinate and establish before the heat of summer arrives, promoting strong growth and healthy plants. 

Can I put hollyhock seeds straight into the ground?
Yes! Hollyhock seeds can be sown directly outdoors in the spring after the last frost date for your region. Choose a well-drained location with full sun to partial shade and prepare the soil by loosening it to a depth of 15-20 cm and removing any weeds or debris. Scatter the seeds over the prepared soil surface, then lightly press them into the soil. Keep the soil consistently moist until the seeds germinate (usually in 7-21 days depending on the variety).

Do hollyhocks like sun or shade?
Hollyhocks thrive in locations where they receive at least 6 hours of direct sunlight per day. In areas with very hot summers, providing some afternoon shade can help protect them from intense heat and prevent wilting. However, hollyhocks grown in too much shade may become leggy and produce fewer blooms.

Does hollyhock spread?
Hollyhocks can spread through self-seeding, meaning they produce seeds that fall to the ground and germinate, giving rise to new plants in the vicinity. Additionally, some hollyhock varieties may spread through underground runners or rhizomes, although this is less common compared to seed-dispersal. Overall, while hollyhocks can spread modestly under favorable conditions, they are not typically aggressive or problematic in terms of invasive growth.

Are hollyhocks easy to grow?
Although hollyhocks are not the quickest bloomers, they are generally considered easy to grow. They tolerate a variety of conditions, require moderate watering, and can handle some neglect. Expect blooms in their second year, but the wait is worth the tall, eye-catching flowers!

Do hollyhocks do well in pots?
Yes, hollyhocks can be grown in pots, but they generally prefer to be planted directly in the ground because of their deep taproots. If you go the container route, choose a planter that is at least 45-60cm in width and depth that has good drainage.

What is the lifespan of a hollyhock flower?
Hollyhock flowers last on the plant about 7 to 10 days. Extremely hot weather can cause them to wilt a bit earlier. Regular deadheading can prolong the blooming period and encourage the plant to produce more flowers.

Where do hollyhocks grow best?
Hollyhocks grow best in locations with full sun and well-drained soil. They prefer rich, loamy soil but can tolerate a wide range of soil types as long as it isn't prone to get waterlogged. Hollyhocks thrive in areas with moderate temperatures and can be grown in flower beds, borders, or cottage gardens.

Do slugs eat hollyhocks?
Yes, slugs like both the hollyhock flowers and the leaves. To protect hollyhocks from slug damage, consider using organic slug control methods such as barriers, traps, or natural repellents like diatomaceous earth or copper tape.

How deep to plant hollyhock seeds?
Hollyhock seeds should be planted about 0.5 centimeters deep in well-draining soil. Just gently press the seed into the soil and keep the soil consistently moist until the seeds germinate.

How do you start hollyhock seeds?
To start hollyhock seeds indoors, fill a well-draining pot or seed tray with seed-starting mix and moisten the soil lightly. Gently press the seeds into the soil and place the container in a warm location with indirect sunlight. Keep the soil moist until germination. Once the seedlings have developed true leaves, transplant them into larger pots or directly outside if all risk of frost has passed.

Is hollyhock poisonous to dogs?
Yes, hollyhocks are considered toxic to dogs if ingested. Please keep hollyhocks and other potentially toxic plants out of reach of pets. If you suspect your dog has ingested hollyhock or any other toxic plant, seek veterinary attention immediately.

What do hollyhocks look like the first year?
The first year, hollyhocks typically grow as low rosettes of foliage without producing any flowers. They focus on establishing their root system and foliage growth during this initial year and will flower the second year after planting.

Do hollyhock seeds need dark to germinate?
No, hollyhock seeds do not require darkness to germinate. They typically germinate best when sown on the surface of the soil and kept moist in a warm location with indirect sunlight.

Should you deadhead hollyhocks?
Yes, deadheading hollyhocks can encourage prolonged flowering. Removing spent blooms prevents the plant from putting energy into seed production, prompting it to produce more flowers instead. Deadheading also tidies up the look of the plant.