What Depth of Soil Does a Hosta Require?

Hosta leaves can add ornamental interest to your garden.

Hosta leaves can add ornamental interest to your garden.

Hostas (Hosta spp.) are ideal for filling shady areas in your garden where other plants might not thrive. Known for their impressive foliage, these herbaceous perennials can grow in U.S. Department of Agriculture plant hardiness zones 3 through 9 where they can yellow and go dormant as cooler temperatures set in. For optimal growth, proper soil preparation and depth is essential to accommodate the plant's root span.

Hosta Characteristics

Hosta, a genus native to China, Korea and Japan, consists of about 40 different species. They're commonly grown for their often heart-shaped or narrow foliage, which can range in color from blue-gray to green or golden, and appear shiny, matte, striped or variegated. Depending on the variety, hostas can grow anywhere from 8 inches to about 4 feet tall and spread several inches to 8 feet wide. In mid-summer, the plants adorn gardens with white or lavender blooms, and with proper conditions, the plants reach full maturity in four to eight years.

Soil Preparation

Most hosta varieties thrive in an area with morning sun and afternoon shade. They can be planted at any time during the growing season, but some prepping beforehand is required. A soil test, for instance, can determine whether you need to amend the soil in your garden to reach a pH between 6.5 and 7.5, which is ideal for growing the plants. Also, cultivate the soil to a depth of 12 to 16 inches, spread a 6-inch layer of compost over the soil, and then till it in. This will add nutrients and promote drainage.

Planting Depth

Hostas are not deep rooting -- their roots are more likely to spread horizontally, which makes the width of the planting hole slightly more important than the depth. A planting hole that's 12 to 16 inches deep is sufficient. Make the width of the planting hole at least one-and-a-half times the size of the mature clump. Larger hostas, for instance, might require a hole with a diameter of 3 to 5 feet. Make a mound at the bottom of the hole and spread the roots over it. Plant the hosta at a depth that is the same depth it was previously growing.


Hostas need regular water of a minimum of 1 inch per week, especially during the growing season and dry periods. If they lack water, the leaves can yellow and wilt, and the plants can die back, only to return with smaller leaves when sufficient water is provided. Water the soil around the plants early in the day and avoid wetting the foliage. To provide nutrients, mulch around the plants every year in the fall with a 2-inch layer of compost.

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