Rosinweed
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Silphium integrifolium
Silphium integrifolium, commonly called rosinweed or whole-leaf rosinweed, grows in prairies, glades, railroad right-of-ways, and roadsides in the Midwest and southern states. Silphiums typically grow 2-3 feet tall, though they can grow up to 6 feet tall. Leaves are medium green, with smooth or finely serrated margins, on the erect, hairy stems. There is a wide variety of leaf shapes, from lanceolate to ovate to elliptic. Mid-summer brings corymb-like inflorescences with flowers resembling small sunflowers. Each flower has yellow rays and a yellow disk in the center. There is a reflexed tip on the bracts that cover the flowers.
A well-drained, medium moisture soil in full sun is ideal for growing this plant. It tolerates some light shade. Once established, it can also tolerate some drought. Various soils can be used, including sandy, loamy, and clay soils. The establishment of plants in the garden can be slow, particularly when they are grown from seed. In optimum growing conditions, plants often self-seed. As plants grow, they develop taproots. Once established, the division is not recommended.
BONAP MAP
Height: 2’-6’
Spread: 1’-3’
Bloom: July-September
Light: Full Sun
Water: Medium
Zone: 4, 5, 6, 7, 8
Origin: Central North America
Deer Resistant: No
Winter Shipping: We will continue to ship throughout winter. If you prefer, we are happy to hold your order until spring; please include that request in your shipping notes.
When you order plants from our nursery, you can expect them to arrive in the best possible condition. Our team carefully packs each order using sturdy, biodegradable packaging materials.
Your plants' appearance may vary depending on the season and their current growth stage. We may cut back the leafy growth of some plants to prepare them for shipment and transplanting.
5 Gallon and Up: Any plant purchased to ship over 5 Gallons will be shipped bare root. This means we will remove the plant from its original pot, remove the soil surrounding the roots, and wrap the roots with a biodegradable plastic bag. This reduces weight and the likelihood of damage during shipping.
Once your plants arrive, it is essential to plant them as soon as possible. This will help them rebound and thrive. If you cannot plant immediately, water regularly and keep the roots off heat-conducting surfaces.
Newly transplanted plants often require more water until their roots are well established. Plan to water them 1-3 times weekly for the first few months.
