Hypericum Calycinum; Commonly Called St John’s Wort Or Rose Of Sharon, These Summer Flowering, Evergreen Shrubs Bear Golden Flowers With Showy Stamens Amid Large, Oval Deep Green Leaves. The Flowers Give Way To Clusters Of Autumn & Winter Berries That Look Good In Floral Arrangements. Despite Their Exotic Looks Hypericum Calycinum Are Easy To Grow & They Are Ideal Spreading Shrubs To Give Low Maintenance, Weed-suppressing Ground Cover, Especially. grow Hypericum Calycinum In Full Sun Or Partial Shade In Moist, But Well Drained Soil. plantingdig A Hole Large & Deep Enough To Take The Plant’s Root Ball.gently Tap The Plant Out Of Its Pot Without Disturbing The Soil Around The Roots.position The Plant In The Hole So The Plant’s Crown Is Level With The Surface & Sits At The Same Depth As It Was In The Pot; Make Sure The Roots Are In Direct Contact With The Soil.backfill With The Excavated Soil & Firm In Gently.water To Settle The Soil Around The Roots. aftercare.watering: Water Regularly In The First Few Weeks After Planting But Don’t Overwater. The Plants Will Send Their Roots Down In Search Of Moisture As They Grow.feeding: Give Plants A Boost If Necessary With A Handful Of Granular Feed Hoed Into The Soil In Spring.pruning: Keep Hypericum Calycinum Neat By Shearing Over The Shrub In Spring.