Rheum
Rheum tanguticum (syn. R. palmatum var. tanguticum) is a fairly uncommon form of Giant Rhubarb, I have included several pictures of it in various stages of growth because it is definitely one of my favourites. This spectacular plant is at home in the bog garden and mine was planted next to a bird bath which frequently overflowed providing an ideal spot for it.
Rodgersia
Rodgersias are another moisture loving plant suited to the pond or stream side. Unfortunately the plant pictured, although in moist soil, did not give of its best as the soil was probably not wet enough. The young leaves have a reddish tint and become quite shiny as they age dying back in the early winter. The flower stems can be left on for winter interest.
Rudbekia
Rudbekias particularly R.fulgida often known as Black-eyed Susan are a staple of the cottage garden border however there are many beautiful varieties, particularly from R.hirta which are used as annual bedding, biennials or short-lived perennials. Native to N.America and Canada they all prefer a moist but well drained soil and will flower best in full sun.
Sanguisorba
Burnets are members of the rose family that range over the Northern Hemisphere, S.menziesii comes from Alaska. A useful border plant they will tolerate most soil types and grow equally well in sun or part-shade.
Saxifraga
I used to grow many mossy and encrusted saxifrages back in my “alpine days” my favourite being the spectacular S.longifolia, S. fortunei is however a different animal altogether. Introduced from woodland in China it is not widely grown but is an ideal subject for the shaded garden. It looks very different from what many people would think to be a saxifrage but the clue is in the flower if you look closely. Despite it being rare in the UK there are many varieties in cultivation as a result of plant breeders in the far east selecting them for leaf colour rather in the same way as heucheras. One of this lovely plant’s greatest assets is that it flowers from autumn until the frost eventually shuts it down.
Scabiosa
Plants in the genus Scabiosa come in all forms and sizes, annuals, biennials and perennials both evergreen and semi evergreen. There are quite a few cultivars grown in the herbaceous border and cottage garden in colours varying from the most common blue through to deep magenta and white. S.drakensbergensis, as its name suggests comes from the Drakensberg mountains in S.Africa and is a white flowered, clump forming hardy perennial which makes a useful subject for the more informal garden. The specimen shown was grown from seed.
Schizostylis
Schizostylis coccinea or Kaffir Lily is a semi-evergreen rhizomatous member of the Iris family of which there are several cultivars generally ranging through shades of pink. They are fairly easy to grow in a well drained sunny spot and have the added advantage of flowering through autumn and into winter, sometimes still being in flower at Christmas in a mild winter.
Sedum
Sedum is a large genus of plants having both succulent leaves and stems commonly known as stonecrops. They come in many forms from the more familiar creeping plants, border plants such as those shown above, and even shrubs, which to be honest I have never seen. Easy to grow given a well drained soil and sunny position, it goes without saying that they are drought resistant, and are ideal border subjects for autumn colour. The cultivar S. ‘Jose Aubergine’ is remarkable as it has dark leaves similar to the flower colour rather than the more usual silvery grey/green. I swear that the scientists who are studying DNA are there just to make the gardener’s life difficult, Sedum is now reclassified as Hylotelephium and I have just read that our nice and simple Sedum ‘Autumn Joy’ is now Hylotelephium x mottramianum ‘Herbstfreude’ !
Silene
Another massive genus, up to 1000 species, Silene or Campions come in all shapes and forms and are widely distributed as can be seen from the names of the plants illustrated. Really too diverse to delve into here it is sufficient to say that the garden varieties are easy to grow in a well drained soil in a sunny spot, think of them as meadow plants. One drawback worth mentioning is that they are not generally long-lived but on the plus side set copious amounts of seed.
A Plantsman's World 