Silphium mohrii - Rosinweed
Botanical name       : Silphium mohriiÂ
Common name          : Rosinweed, Prairie DockÂ
Colour               : Soft yellowÂ
Flowering time       : July - SeptemberÂ
Full grown height    : ± 140 cmÂ
Light requirement    : Sun, Partial shadeÂ
Moisture requirement : NormalÂ
Winter hardiness     : Till -35°C  (USDA Zone 4)Â
Spacing              : ± 50 cm (± 4 per m²)Â
Details              : Insect friendlyÂ
Pot size             : Square 9 cm, volume 0,5 LiterÂ
Delivery time        : 4 - 9 working daysÂ
Special notes        : -Â
General information about Rosinweed (Silphium):Rosinweed (Silphium) is a genus of very easy perennials which flower for a long time. It is an impressive plant to be planted in the back of the border. Even in winter, Rosinweed adds structure as the stems stay upright. Rosinweed likes a spot in the full sun, but will also do with half shade. The soil should be normal to moist and fertile. A gift of fresh compost in spring is always appreciated. Strong neighbours for Rosinweed are Hemp Agrimony (Eupatorium), Meadow Rue (Thalictrum) and Maiden Grass (Miscanthus). Rosinweed produces a good cut flower and is loved by many insects. Watch out in spring for slugs and snails eating the fresh new shoots.Rosinweed - Silphium mohrii