How Tall Do Hollyhocks Get? - Shiny Plant
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How Tall Do Hollyhocks Get?

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How tall hollyhocks grow totally depends upon the type of variety or cultivar you are growing. They are all distinct from one another in terms of color, form, and size. Some of the hollyhocks grow to be rather tall, while others stay quite short.

In this article, we will examine the varying heights attained by the many species of hollyhocks.

Hollyhocks flowers

How Tall Do Hollyhocks Get

The kind of hollyhock (Alcea rosea) you choose will determine the maximum height it will reach. Due to the fact that many of the species grow to be fairly tall, gardeners often plant them in the far rear of the flowerbed. Hollyhocks, when planted in the right locations, may be used to generate shade that shields delicate plants from the heat of the afternoon sun and maintains pathways at a comfortable temperature. These perennials, which are well-known for their enormous, beautiful blooms, grow best in full sun and demand soil with an average amount of moisture. Many types of hollyhocks are prone to rust, particularly in environments where summers are wet and humid.

Hollyhock growth stage

Hollyhocks are related to mallows, which are also the family that includes hibiscus. The hollyhock is a kind of plant that may either be a biennial or a short-lived perennial. The term “biennial” refers to the fact that the plant’s life cycle takes place over the course of two years. Hollyhocks spend their first year developing their root structure and forming a rosette of leaves. Their blooming stems sprout in the second year, and they blossom throughout that time.

Hollyhocks are easy to grow from seed and produce beautiful flowers. There are a few distinct species that are typically cultivated, as well as a great number of cultivars and heritage types available for selection. Read how to grow Hollyhock flowers.

Black Hollyhock

Black hollyhock

According to the United States Department of Agriculture, some hollyhock types may reach heights of 4.3 to 6.8 feet when grown in plant hardiness zones 2 through 9. 

The black hollyhock, also known as Alcea rosea “Nigra,” is a rare and historically significant selection. It has huge, solitary flowers that are a dark purplish-maroon color. Hollyhocks with double flowers and pompom centers are known as double hollyhocks. They are available in many different colors, including one called “Peaches and Dreams” which has blossomed in a peachy-pink tone. Both types include bare bottom stems, thus they are most attractive when placed in front of other plants.

Read: Do Hollyhocks Spread?

Spotlight Polarstar

The Spotlight Series collection of hollyhocks can thrive in USDA zones 3 through 9 and can reach a height of 4.9 to 5.8 feet. Beginning in their second year, they produce vintage-style flowers that only have one bloom per stem. Some types of hollyhocks have leafless stems at the base, but those in the Spotlight Series have a beautiful low mound of leaves instead. You may plant Alcea rosea “Spotlight Polarstar” for white flowers with yellow centers, “Spotlight Mars Magic” for red blooms, or “Spotlight Sunshine” for yellow flowers. These flowers come in a variety of colors and are offered many varieties.

Spring Celebrities Lilac


In USDA zones 6 through 9, compact hollyhocks, also known as Alcea rosea annua, may reach heights of between 2 and 2.4 inches. These miniature kinds have the ability to create bushy plants with robust stems and produce an abundance of huge double blooms with pompon centers. There is a variety known as “Spring Celebrities Purple,” another known as “Spring Celebrities Lilac,” and still another known as “Spring Celebrities Crimson,” all of which feature flowers whose colors correspond to the names of the varieties. This tiny kind of hollyhock, like other types of plants, is attractive to butterflies and hummingbirds.

Queeny Purple

Traditional, original hollyhocks come in a range of heights depending on the kind. This species of Alcea rosea, known as “Queeny Purple,” grows to a height of between 1.6 and 2.4 inches and may thrive in USDA zones 2 through 9. It produces lilac flowers with petal edges that are fringed. In the same temperate zones, “Black Beauty” may reach heights of between 4.9 and 5.8 inches. It features blooms that are a deep purple-black color with maroon centers that stand out. These perennial hollyhocks, like other hollyhocks, are resistant to rabbit damage.

Does watering increase the heights of hollyhocks

A plant is able to benefit from water’s ability to carry vital nutrients throughout its body. The plant is able to extract the nutrients it needs from the soil and utilize them. Hollyhocks will droop if it does not have enough water in their cells, hence water is necessary for a plant to maintain its upright position.

If you do not provide adequate water to your hollyhocks they will stop growing. However, it is not necessary that giving them more water will increase their height. Many people think giving more water and fertilizer to their flowers will result in bigger and better blooms. That’s partially right, but most of the time flowers do not require an extra push to reach maturity if provided the required care. 

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