About Bupleurum
Bupleurum rotundifolium ‘Graffiti’ is a hardy annual that thrives in full sun and grows to a height of 36 inches. In frost-free zones it can grow as a perennial. Known for its unique foliage and flower structure, it’s a popular choice for both garden landscapes and floral arrangements.
When to Plant Bupleurum Seeds
In warmer zones directly sow seeds into the garden in late fall. In the colder zones, direct-seed into the garden six weeks before spring’s last frost date.
Where to Plant Bupleurum Seeds
Choose a location that receives full sunlight. Ensure the soil is well-drained and has been loosened. If necessary, amend with compost to improve fertility, texture, and drainage.
How to Plant Bupleurum Seeds
Bupleurum seeds can be challenging to start indoors, so direct seeding is recommended. Bupleurum seeds need a period of cold stratification to enhance germination. In milder climates without a frost, place the seeds in the freezer for 10 to 14 days before sowing in the fall. In the colder zones, skip the freezer and give your seeds a natural stratification by planting your bupleurum seeds six weeks before the last frost date in your area.
Sow seeds shallowly, barely covering them with soil, as they require some light to germinate. Space seeds 8 to 16 inches apart to allow for ample growth. Keep the soil consistently moist but not waterlogged until germination occurs, usually in 14 days at 55°F to 60°F. Once established, water moderately. Do not pinch bupleurum plants as this can inhibit their natural growth pattern.
How to Care for Bupleurum
Bupleurum takes about 80 to 90 days to reach maturity from seed. Monitor for pests and diseases regularly. Although bupleurum is relatively low-maintenance, it can occasionally attract aphids. Fertilize lightly midway through the growing season to support robust growth.
Harvest the flowers when they are fully open to maximize vase life and prevent wilting. Cut stems early in the morning and place immediately in water. Expect a vase life of 8 to 10 days with proper care, including changing the water every few days.