Hypericum patulum
Goldencup St. Johnswort
Type Shrub, woody plant
Hardy range 6B to 7B
Height18" to 3' / 45cm to 1.00m
Spread30" to 4' / 75cm to 1.20m
Growth rate Average
Form Rounded
Exposure Partial shade or partial sun to full sun
Persistence Evergreen and semi-evergreen
Bloom Color Yellow
Bloom Time Summer
The flowers are showy.
Leaf Color Green, pink, purple, variegated and yellow
Fall Color No change in fall color
This plant has attractive foliage.
Environment
This plant tolerates some drought. This plant will grow in dry soil. Suitable soil is well-drained/loamy, sandy or clay. The pH preference is a neutral soil.
Culture Notes
These shrubs prefer light loamy soil and a fairly sunny position. They are improved by severe pruning in the spring, with old, weak shoots cut out and the remainder cut to 9-12 inches.
Planting and establishing shrubs
The most common cause of young plant failure is planting too deep. Plant the root ball no deeper than it was in the nursery. In most instances, the root flare zone (point where the top-most root in the root ball originates from the trunk) should be located just above the landscape soil surface. Sometimes plants come from the nursery with soil over the root flare. If there is soil over this area, scrape it off. The planting hole should be at least twice the width of the root ball, preferably wider. In all but exceptional circumstances where the soil is very poor, there is no need to incorporate anything into the backfill soil except the loosened soil that came out of the planting hole. Never place ANY soil over the root ball. If a row or grouping of plants is to be installed, excavating or loosening the soil in the entire bed and incorporating organic matter enhances root growth and establishment rate.
Weed suppression during establishment is essential. Apply a 3-inch thick layer of mulch around the plant to help control weed growth. Keep it at least 10 inches from the trunk. If you apply it over the root ball, apply only a one or two inch layer. This allows rainwater and air to easily enter the root ball and keeps the trunk dry. Placing mulch against the trunk or applying too thick a layer above the root ball can kill the plant by oxygen starvation, death of bark, stem and root diseases, prevention of hardening off for winter, vole and other rodent damage to the trunk, keeping soil too wet, or repelling water. Regular irrigation through the first growing season after planting encourages rapid root growth, which is essential for quick plant establishment.
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