Hypericum majus, the greater Canadian St. John's wort, is a perennial herb native to North America. The specific epithet majus means "larger". The plant has a diploid number of 16.
Large St. John's wort is fairly disease resistant and typically does not suffer from illnesses. However, it can be vulnerable to pests and diseases present in its environment. These outbreaks are usually mild. In terms of care, the plant requires a moderate level of maintenance. It should be pruned regularly to preserve a tidy appearance and encourage healthy growth. Fertilizing can also help stimulate flowering. Large St. John's wort is suitable for anyone with outdoor space, such as a garden or patio, and does not demand extensive care experience. It may need more attention when grown indoors.
How to keep Hypericum Majus.
Light
Large St. John's wort comes from bright, open habitats and performs best in full sun. It will tolerate partial sun but favors direct sunlight for optimal growth. This plant, which may be annual or biennial, is known for its sun-loving nature.
Temperature
Large St. John's wort can tolerate a wide range of temperatures, but its distribution may still be restricted by different combinations of moisture and heat. It does best in warm summer climates when there is sufficient rainfall or watering. Extended periods of cloudy, rainy weather, as well as prolonged high temperatures, can raise the chances of Large St. John's wort dying. In winter, providing proper protection from the cold can improve the plant's survival.
Fertilizer
After Large St. John's wort has opened most of its blooms to full size, resume fertilizing. Around the peak bloom period, apply fertilizer every three to four weeks, weather permitting. Then, once the plant begins to produce fewer new blooms, stop fertilizing; there is no need to fertilize when it can no longer produce additional blooms.
Pruning
Large St. John's wort is characterized by its dense growth and bright yellow flowers. To maintain the health and beauty of this plant, it's important to prune it in early spring. Start by removing any dead branches and spent flowers. Then, thin out overcrowded areas to improve air circulation. Regular pruning not only helps control the plant's size and shape, but also reduces pests, ensuring a robust and thriving plant.
Botanical profile.
- Plant Type
- Herb
- Life Cycle
- Annual
- Genus
- Hypericum
- Family
- Hypericaceae
- Hardiness Zone
- 4-9
- Mature Height
- 15 cm to 76 cm
- Mature Spread
- 20 cm to 30 cm
- Leaf Color
- Green, Dark Green
- Leaf Type
- Deciduous
- Flower Color
- Yellow
- Flower Size
- 1.02 cm to 1.52 cm
- Bloom Time
- Summer
- Planting Time
- Spring, Summer, Autumn
- Harvest Time
- Late summer, Early fall, Mid fall
Other names.
Reader questions.
What are the sunlight requirements for Large St. John's Wort?
Large St. John's Wort (Hypericum majus) thrives in areas that receive full sun, which is characterized by more than 6 hours of sunlight per day. It can also grow in partial sun, requiring about 3 to 6 hours of sunlight per day. It's important to observe the way sunlight moves through your garden to find spots that offer the ideal mix of light and shade, ensuring the plants' well-being and happiness.
