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Silphium (Rosin Weed)

Rosin Weed, Compass Plants or Prairie Docks from North America are winter hardy, tall growing perennials with numerous large, bright sulfur yellow flowers in mid summer. They are native of humus rich, semi-moist soils in prairies and open spots in woods. All are easily grown in any rich, well-drained soil in a sunny to partially shaded spot.
Sow seeds flat in any rich, well drained soil. Keep pots in a sunny, protected spot outside. Most species require a cooling period of several months prior to germination. If these species are sowed late in the year, they do not germinate before spring in the following year. Transplant to the final spot in the garden from mid summer to early autumn.
All are USDA Climate Zone 6.
20 seeds per package.
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Silphium integrifolium (Rosin Weed)

Silphium integrifolium (Rosin Weed)

170 (250)cm, Rosin Weed is a tall and showy herbaceous perennial with large, smoothly haired, entire leaves on a purplish stem with terminal lose racemes of bright sulfur yellow flowers. It is native of rocky and dry open woods in central USA. Easily grown in a rich, well drained soil in a preferably sunny spot. VII-IX.
20 seeds per package.

price (plus Shipping Costs)
seed package 0021 € 3,99*
* This price is valid if a single item is ordered only. The shop will automatically assign discounts on bulk purchases. If several packages are ordered from this species, they will be merged into a single package. Please refer to our General Terms of Business.
Silphium laciniatum (Compass Plant)

Silphium laciniatum (Compass Plant)

100 (200)cm, Compass Plant is a very showy herbaceous perennial with strongly dissected leaves which work as a compass since they orient themselves north-south. The large bright yellow, sunflower-like flowers are terminally born. This species is native of rich or dry soils in prairies in eastern North America. Easily grown in a rich, well drained soil in a preferably sunny spot. VII-VIII.
20 seeds per package.

price (plus Shipping Costs)
seed package 0022 € 7,99*
* This price is valid if a single item is ordered only. The shop will automatically assign discounts on bulk purchases. If several packages are ordered from this species, they will be merged into a single package. Please refer to our General Terms of Business.
Silphium perfoliatum (Cup Plant)

Silphium perfoliatum (Cup Plant)

200 (350)cm, Cup Plant is a very showy, very tall herbaceous perennial with large leaves forming a cup around the stem to withhold rain and bright yellow flowers in terminal lose clusters. Native of rich soils in open woods, along side streams and moist meadows in east-central North America. Easily grown in a rich, well drained soil in a partially shaded to sunny spot. VII-IX.
20 seeds per package.

price (plus Shipping Costs)
seed package0023 € 4,99*
seed package
* This price is valid if a single item is ordered only. The shop will automatically assign discounts on bulk purchases. If several packages are ordered from this species, they will be merged into a single package. Please refer to our General Terms of Business.
Silphium terebintheaceum (Prairie Dock)

Silphium terebintheaceum (Prairie Dock)

170 (220)cm, Prairie Dock or prairie rosinweed is a very showy herbaceous perennial from semi-moist meadows and prairies throughout estern-central USA. It makes a dense basal rosette of large, slightly glossy leaves and very tall, losely branching flower stalks with bright yellow daisy-like flowers. Easily grown in any humus rich, slightly moist, yet well drained soil in a preferably sunny spot. VII-VIII.
20 seeds per package.

price (plus Shipping Costs)
seed package9293 € 7,99*
* This price is valid if a single item is ordered only. The shop will automatically assign discounts on bulk purchases. If several packages are ordered from this species, they will be merged into a single package. Please refer to our General Terms of Business.
Silphium trifoliatum (Whorled Rosin Weed)

Silphium trifoliatum (Whorled Rosin Weed)

150 (300)cm, Whorled Rosin Weed is a very showy, tall herbaceous species with lance-shaped to ovate leaves arranged in distinct whorls of three to five and sunflower-like bright yellow flowers. Native of rich soils in open woods. Easily grown in a rich, well drained soil in a partially shaded to sunny spot. VII-IX.
20 seeds per package.

price (plus Shipping Costs)
seed package 0024 € 4,99*
* This price is valid if a single item is ordered only. The shop will automatically assign discounts on bulk purchases. If several packages are ordered from this species, they will be merged into a single package. Please refer to our General Terms of Business.