Silphium

A great genus close to the sunflowers that, although often very tall, produce a very compact rootstock and are best displayed among low-growing plants.

Silphium terebinthinaceum

This and S.laciniatum produce among the biggest, most luxuriant leaves of any hardy border perennial.

In this case they are huge and heart-shaped (like a Colocasia or Anthurium?) to 12ins across.

The flower stem is more slender and smooth than laciniatum.
sold out

Silphium simpsonii

A smaller species with simple green leaves and golden flowers
£8

Silphium laciniatum

Leaves to 2ft long and impressively lobed, like some huge tropical fern. The stiff bristly upright flower stem is a bonus.

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.
£9

Silphium perfoliatum

A giant perennial sunflower with lush green foliage and good-quality yellow flowers to 3ins across. Up to 9ft tall.

Compact rootstock - not spreading.

£10