Hypericum shrub is a plant that is native to Europe and Asia. It is a member of the Hypericaceae family and is closely related to the common Saint John's wort (Hypericum perforatum). The shrub has many branches and small, dark green leaves. The flowers are small and yellow, and they bloom in the summer. The fruit is a small, black berry.
Related plant:
Hypericum Moserianum
Related plant:
Hypericum Hidcote
About soil condition, hypericum shrub prefers well-drained soils but can also tolerate some seasonal wetness or even brief inundation. It is not as particular about soil type as long as it is not waterlogged. It will grow in sandy soils, loams, or clay loams, and does not mind a little salt.
So, like the other plants, Hypericum shrubs need sunlight to grow. They require at least six hours of sunlight each day to thrive. If they don't get enough sunlight, they will become leggy and may not bloom as much.
The temperature conditions that are best for Hypericum shrubs are those that are cool and moist. They will do well in full sun or partial shade, but they will need some protection from the hot afternoon sun. These shrubs prefer a loamy soil that is well-drained, but they will tolerate most soil types as long as it is not too dry.
Ideal humidity condition for this plant is around 40%. If the humidity goes below 30%, the leaves will start to dry out and fall off. If the humidity gets too high, the leaves will start to yellow and the plant will become stunted.
The fertilizer, this type of plant needs, is high in phosphorus, which helps encourage blooming. It's important not to over fertilizer, because too much phosphorus can actually prevent blooming. The roots of a hypericum are relatively shallow, so be careful not to damage them when you're working in the garden.
Pruning your hypericum shrub is important to maintaining its shape and preventing it from getting too large. You can prune your hypericum shrub in the spring or fall. To prune, start by removing any dead or damaged branches. Then, cut back any branches that are growing too long or that are rubbing against other branches. When you are finished pruning, your hypericum shrub should have a nice, even shape.
Propagation is typically done through stem cuttings taken from new growth in late spring or early summer. The cuttings should be 4-6 inches long and have several sets of leaves. Remove the bottom leaves and dip the cuttings in rooting hormone before planting in well-drained, sandy soil. Keep the soil moist but not wet and provide bright, indirect light. You should see new growth within 6-8 weeks.
Usually, the plant growth rate is determined by the amount of sunlight the plant receives and the type of soil in which it is grown. In general, hypericum shrubs prefer full sun but will tolerate partial shade. They also prefer well-drained soils.
Common problems for this kind of plant are a result of too much or too little water. If the plant is overwatered, the leaves will yellow and drop off. If the plant is underwatered, the leaves will wilt and the plant will eventually die. The best way to avoid these problems is to water the plant only when the soil is dry.
Source:
Managing Pests in Gardens: Trees and Shrubs: HypericumUC IPM - ucanr.edu
Hypericum androsaemum | Landscape Plants | Oregon State
Hypericum kouytchense | Landscape Plants - Oregon State
