“Feet in the shade, head in the sun” is the usual mantra for clematis, but there a few exceptions. Some have flowers that fade or bleach in full sun; a position in light shade suits them better. C. ‘Nelly Moser’ is one such while another is ‘Guernsey Cream.’
This latter variety grows six to eight feet tall (don’t tell my plant that s it has grown to ten feet – so far!) The flowers begin to open toward the end of May, a very pale creamy white with a slight green bar in the middle of the petals.
In cold springs, the green is very marked. There can also be a small flush of blooms in September.
As with many climbers, most of the flowers are carried at the top of the plant, in better light. This can be countered by tying in the growth more horizontally every few days.
This clematis falls into Group 2 for pruning which consists of a light cutting back as the growth buds start to break in the spring. If the plant becomes a mass of tangled wood at the base, it may warrant a heavier pruning (after flowering) although this may sacrifice the flowers the following year.