Planting Hostas in Garden Soil
Successful Hosta growing begins with proper soil preparation. If possible, prepare your Hosta bed during autumn by double digging the area and leaving the soil rough over winter. Frost will naturally break down the soil structure, creating a better planting environment for spring growth.
In early spring, fork over the soil and rake it to a fine level surface. Apply a quality organic slow-release fertiliser and work it lightly into the soil before planting.
When planting Hostas, dig a hole at least twice the width and depth of the root ball. For example, if the Hosta clump is 10cm wide, dig a planting hole approximately 20cm wide and twice as deep.
Add leaf mould or well-rotted organic compost to the base of the planting hole and lightly fork it into the soil. Create a small mound in the centre of the hole and spread the roots evenly over the mound. Ensure the growing points (eyes) sit at the same level they were growing previously.
Backfill with a mixture of garden soil, horticultural grit and compost. Avoid excessive firming, as Hosta roots benefit from good soil aeration. Water thoroughly using a watering can fitted with a fine rose, allowing the water to soak gently into the soil without washing it away from the crown.
Planting Hostas in Containers
Hostas grow exceptionally well in containers provided they are planted in a free-draining compost mix. You can either make your own compost blend or use a high-quality soil-based compost.
Making Your Own Hosta Compost Mix
Combine sterilised topsoil, 10% horticultural grit, and organic matter such as leaf mould, composted seaweed or composted paper products. Add dolomitic lime at approximately 3kg per 1,000 litres of compost mix.
The finished compost should feel moist but not wet. When squeezed in your hand, it should hold together without releasing water.
Choosing a Commercial Compost
Soil-based composts are generally preferred for growing Hostas in containers. Add approximately 10% horticultural grit by volume, especially when planting miniature Hostas. Always choose fresh compost and avoid bags that may have been stored outdoors for long periods, as nutrients can become depleted or unevenly distributed.
Potting Up Hosta Divisions
Before planting, soak the Hosta division in water for a few minutes to reduce transplant shock. For containers smaller than 20cm in diameter, add broken crocks or packaging chips to the base to improve drainage, then cover with a layer of newspaper before adding compost.
Position the Hosta so the eyes are level with the compost surface. Fill around the roots with compost, gently firming with your fingers and tapping the container lightly to settle the mix without compacting it.
Leave approximately 2.5cm below the rim of the pot for watering. Finish with a decorative mulch of coarse grit or gravel. This helps retain moisture, suppress moss growth and improves the appearance of the container.
Water thoroughly after planting and allow excess water to drain away freely.
Growing Hostas Successfully
Hostas thrive in fertile, moisture-retentive but well-drained soil. They perform best in partial shade, although some varieties tolerate more sun when provided with adequate moisture. Regular watering, annual mulching and occasional feeding will encourage healthy foliage and vigorous growth throughout the growing season.