Species Roundleaf Thorowax
yellow-lime flowers with light-green stems and green leaves

Roundleaf Thorowax

Bupleurum rotundifolium

Also Known As - Hare's Ear
Roundleaf Thorowax is a perennial plant found in many regions of the world. It has a basal rosette of bright green, slightly toothed, round leaves that form a dense mass up to 30 cm tall. The yellow flowers are small, urn-shaped and clustered in umbel-shaped inflorescences. It is a low-maintenance perennial, needing little attention and growing in sun or shade, as long as there is well-draining soil. It is drought tolerant and perfect for xeriscaping. The Roundleaf Thorowax is an ideal choice for pollinator gardens, attracting bees and butterflies. It is also an excellent species for attracting beneficial insects.

Watering:

Minimal

Hardiness Zone:

Sun:

full sun,part shade

Fruits:

brown,tan,black Fruits Ready In

Leaf:

Yes

Leaf Color:

green,tan

Growth Rate:

Low

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Care Level:

Medium

watering

Great Pignut requires moderate to regular watering to thrive. The soil should be kept moist, but not overly wet; water whenever the top 2 inches of soil feels dry. During rainy periods, it is best to reduce watering to ensure that the soil does not become waterlogged. During the growing season, water the plant when the top 2 inches of soil feels dry, and water again when the top inch of soil approaches dryness. During the dormant season, reduce watering frequency until the top 2 inches of soil feels dry.

sunlight

The Great Pignut (Bunium bulbocastanum), a perennial plant species, requires full or partial sunlight for optimal growth and health. Full sunlight of at least 6 to 8 hours per day is best for this plant species. If the Great Pignut is planted in areas of partial sunlight, they should receive no fewer than 4 hours of direct sunlight each day. In addition, it should be noted that too much full sunlight may cause this species' foliage to become scorched, so when finding an ideal spot for this plant, it is advised to choose an area that receives partial morning or afternoon sunshine.

pruning

Pruning for the Great Pignut species should occur every 3 years. Pruning the plants should occur right before the growth season begins. Prune away any dead and damaged branches, and thin out the stems so light can penetrate the inner areas of the plant. This will help the plant to remain healthy and flowering. To prune, start by cutting away the broken or diseased branches. Make your cuts slightly above the point of damage and remove the entire branch. Then, trim off any long, leggy branches that cross over each other and any other shoots growing in the wrong direction. Finally, thin out the remaining branches to promote light circulation and air flow, working in a pyramid-shape from top to bottom deloping thinning evenly. The amount of pruning will depend on how overgrown the plant is when you begin. A light prune may only involve cutting off the damage branches, while a heavy prune will involve pruning back a large portion of the stems to invigorate new growth.

⚠️ Perenual and its members cannot be held liable for any health issues that may arise from the information provided on the website or from using any of the plants found on the site. The information provided is intended to be used as general guidelines only.