Silphium terebinthinaceum
![Silphium terebinthinaceum](https://live.staticflickr.com/8615/29698087810_71d1e2deb4_b.jpg)
This and S.laciniatum produce among the biggest, most luxuriant leaves of any hardy border perennial.
![Silphium terebinthinaceum](https://live.staticflickr.com/7224/7189416595_b9646e1edc_b.jpg)
In this case they are huge and heart-shaped (like a Colocasia or Anthurium?) to 12ins across.
![Silphium terebinthinaceum](https://live.staticflickr.com/8122/29991916475_92117d45c0_b.jpg)
The flower stem is more slender and smooth than laciniatum.
in production
![Silphium laciniatum](https://live.staticflickr.com/2948/15196991549_30d547777c_b.jpg)
Leaves to 2ft long and impressively lobed, like some huge tropical fern. The stiff bristly upright flower stem is a bonus.
![Silphium laciniatum](https://live.staticflickr.com/65535/48071750291_05525dcff2_b.jpg)
Easy in any fertile, retentive soil, and best at the front of the border where its stature can be appreciated. Perfect for prairie-style plantings.
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