North America Non-native Plant

Hypericum Patulum

Botanical name: Hypericum patulum

USDA symbol: HYPA12

Native status: Not native but doesn't reproduce and persist in the wild

Hypericum patulum: A Cheerful Addition to Your Garden Palette If you’re looking for a shrub that brings sunshine to your garden with minimal fuss, Hypericum patulum might just catch your eye. This delightful member of the St. John’s wort family offers bright yellow blooms and a remarkably easy-going nature that ...

Hypericum patulum: A Cheerful Addition to Your Garden Palette

If you’re looking for a shrub that brings sunshine to your garden with minimal fuss, Hypericum patulum might just catch your eye. This delightful member of the St. John’s wort family offers bright yellow blooms and a remarkably easy-going nature that appeals to both novice and experienced gardeners.

What’s in a Name?

While Hypericum patulum doesn’t have widely recognized common names in English-speaking regions, it belongs to the beloved St. John’s wort family. You might occasionally hear it referred to simply as spreading St. John’s wort due to its growth habit, though this name isn’t standardized across all regions.

Where Does It Call Home?

This charming shrub hails from the mountainous regions of China and the Himalayas, where it has adapted to thrive in diverse conditions. As a non-native species in North America, it brings an international flair to gardens while generally playing well with other plants.

A Visual Treat for Your Garden

Hypericum patulum truly shines when it comes to aesthetic appeal. Its bright yellow, five-petaled flowers feature prominent stamens that create an almost cheerful, sunburst effect. The glossy green foliage provides an attractive backdrop year-round, making this shrub a reliable performer even when not in bloom. The flowers typically appear in summer and can continue sporadically into fall, giving you months of golden color.

Garden Design Magic

This versatile shrub works beautifully in several garden settings:

  • Mixed borders where its bright blooms can pop against darker foliage
  • Foundation plantings for a cheerful welcome near entryways
  • Cottage-style gardens where its informal growth habit fits perfectly
  • Rock gardens or slopes where its adaptability shines

With its moderate size and spreading habit, Hypericum patulum typically reaches 3-4 feet in height and width, making it perfect for mid-border placement or as a foundation accent.

Growing Conditions That Make It Happy

One of the best things about Hypericum patulum is its adaptable nature. Here’s what it prefers:

  • Sunlight: Full sun to partial shade (though more sun means more flowers)
  • Soil: Well-draining soil of average fertility
  • Moisture: Moderate water needs; drought tolerant once established
  • Climate: Hardy in USDA zones 6-9

Planting and Care Made Simple

Getting Hypericum patulum established in your garden is refreshingly straightforward:

  • Plant in spring or fall when temperatures are moderate
  • Dig a hole twice as wide as the root ball but no deeper
  • Water regularly the first year to help establish roots
  • Once established, it’s quite drought tolerant
  • Prune lightly in late winter or early spring to maintain shape
  • No special fertilization needed in average soils

Friends with Benefits: Wildlife and Pollinators

While Hypericum patulum may not be native, it still offers value to local wildlife. The bright yellow flowers attract bees and other pollinators during the blooming season, contributing to your garden’s ecosystem. However, it won’t provide the same level of wildlife support as native alternatives.

Should You Plant It?

Hypericum patulum is a solid choice if you’re looking for a low-maintenance shrub with reliable yellow blooms. While it’s not invasive or problematic, consider these factors:

Reasons to plant it: Easy care, attractive flowers, adaptable to various conditions, good for pollinators

Consider native alternatives: For maximum wildlife benefit, you might explore native options like Hypericum prolificum (Shrubby St. John’s wort) or other native yellow-flowering shrubs suited to your region.

The Bottom Line

Hypericum patulum offers gardeners a reliable, cheerful addition that won’t cause headaches or take over your landscape. While it may not provide the ecological benefits of native plants, it’s a perfectly respectable choice for gardeners who appreciate its sunny disposition and easy-care nature. Whether you choose this international visitor or opt for native alternatives, you’ll be adding valuable color and pollinator resources to your garden space.

Hypericum Patulum

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Theales

Family

Clusiaceae Lindl. - Mangosteen family

Genus

Hypericum L. - St. Johnswort

Species

Hypericum patulum Thunb.

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA