Also known as Shaggy Rosinweed
Mohr's Rosinweed (Silphium mohrii) is a striking perennial wildflower native to the southeastern U.S., featuring large yellow daisy-like flowers.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Prefers at least 6-8 hours of direct sunlight daily for best flowering.
Drought Tolerant Once Established
25% intensity
Allow soil to dry between waterings.
Well-drained
50% intensity
Wide Range
50% intensity
Hardy in USDA zones 4-8; tolerates heat and moderate cold.
Low
25% intensity
Does not require rich soil or heavy feeding; occasional light feeding.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
Non-toxic
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Mohr's Rosinweed prefers well-drained soil and tolerates drought once established. Water deeply but infrequently, allowing the soil to dry out between waterings. Avoid overwatering, which can lead to root rot.
In hotter, drier climates, occasional deep watering may be beneficial during prolonged dry spells.
Pruning is minimal. Deadhead spent flowers to encourage reblooming and maintain a tidy appearance. In late fall or early spring, remove dead foliage and stems to the ground.
This helps prevent disease and promotes healthy new growth for the upcoming season.
Mohr's Rosinweed can be propagated by seed or division. Sow seeds in fall or early spring, either directly outdoors or started indoors.
Division of established clumps is best done in early spring before new growth emerges. This method ensures true-to-type plants.
Repotting is typically not necessary for established garden plants. Container-grown specimens may benefit from repotting every 2-3 years into a slightly larger pot with fresh, well-draining potting mix.
This is best done in early spring before active growth begins.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Mohr's Rosinweed (Silphium mohrii)
Where Mohr's Rosinweed (Silphium mohrii) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Silphium |
| Species | Silphium mohrii |
Similar in genus Silphium
Answers based on plant encyclopedia data
