The Horticultural Society has some wonderful pocket-sized books on clematis, I thought I would share some of their info. I bought this 10 years ago, so the names are from what was available then. I'll post for each group. I hope your lovely vines benefit from the info. I learn something new each time I pick up the book and apply it to one of my pretties.

This group consists of all the species and large-flowering clematis that bloom from mid to late summer, in which the stems grow and bloom in the same season. Many, like herbaceous and texensis, die back during winter. They can be hard prunded in later winter or early spring every year, cutting back all stems to within 12 in/ 30cm of the ground. Prune as growth starts so that you can cut stems back to good buds

1 Remove any dead growth (no buds are visibly breaking). Be careful not to damage any new shoots coing from the base.

2 Cut back remaining stems just above a pair of healthy buds 6-12 inc/ 15-30 cm above ground level. Make a straight cut across the stem.

Clematis addisonii / Clematis aethusifolia / Clematis x aromatica

Clematis x bonstedtii

Crepuscule -

Clematis campaniflora / Clematis crispa / Clematis x durandii / Clematis x eriostemon

Clematis flammula / Clematis fusca var. violacea

Clematis heracleifolia var. davidiana

Wyevale -

Clematis hirsutissima /

Clematis integrifolia

Alba - Rosea

Clematis x jouiniana

Praecox -

Clematis ladakhiana / Clematis potaninii /

Clematis recta

Purpurea -

Clematis rehderiana / Clematis serratifolia / Cleamatis tangutica / Clematis terniflora

Clematis texensis / Clematis tibetana

Clematis triternata

Rubromarginata -

Clematis viticella

Mary Rose - Purpurea Plena Elegans

Abundance - Alba Luxurians - Arabella - Ascotiensis - Betty Corning

Bill MacKenzie - Black Prince - Blue Angel (Blektiny Aniol)

Blue Boy - Comtesse de Bouchaud - Duchess of Albandy - Dorothy Walton

Elvan - Ernest Markham - Etoile Rose - Etoile Violete -

Gipsy Queen - Gravetye Beauty - Guiding Star - Hagley Hybrid

Huldine - Jackmanii - Jackmanii Superba - John Huxtable

Kermesina - Lady Betty Balfour - Lady Bird Johnson - Madame Edouard Andre

Madame Julia Correvon - Madame Grange - Margaret Hunt - Margot Koster

Minuet - Pagoda - Paul Farges - Perle d/Azur - Perrin's Pride

Pink Fantasy - Polish Spirit - Prince Charles - Princess Diana - Rhapsody -

Rouge Cardinal - Royal Velours - Venosa Violacea - Victoria - Ville de Lyons