How to Fertilize clematis [Cassis]?
Low nitrogen feed in spring, higher potash before flowering
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clematis [Cassis] · Clematis Cassis ('Evipo020')
Plant in a 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 at the base. Plant with the crown 5-8cm deep to encourage new shoots to grow from below ground level. See clematis cultivation for further advice
Low nitrogen feed in spring, higher potash before flowering