How to Fertilize clematis 'Ascotiensis'?
Low nitrogen feed in spring, higher potash before flowering

clematis 'Ascotiensis' · Clematis 'Ascotiensis'
Plant in a moisture-retentive, well-drained soil, with the crown 5-8cm deep to encourage new shoots to grow from below ground level; keep the base of the plant and the roots cool and shaded by other plants or a layer of pebbles or flat stones; see clematis cultivation for more advice
Low nitrogen feed in spring, higher potash before flowering