How to Fertilize Clematis campaniflora?
Balanced clematis feed monthly in spring, higher potash before bloom

Clematis campaniflora · Clematis campaniflora
Tolerant of a range of garden soils but best grown in moisture-retentive, well-drained soil with the roots and base of the plant kept cool and shaded by other plants, or a layer of pebbles. Plant with the root ball 5-8cm below the soil surface to encourage new shoots from below soil level. See clematis cultivation for further advice
Balanced clematis feed monthly in spring, higher potash before bloom