Chinese quinine

Ideal for very sheltered coastal sites, the conservatory or frost-free greenhouse. Enjoys a deep, rich, moist but well-drained soil in partial shade. Flowers are blue on an acidic soil and more lilac to pink on netural to alkaline soil. In containers, use a peat-free John innes compost, or ericaceous compost for darker shades of blue

Propagate by seed, or by semi-ripe cuttings

Generally pest-free

Generally disease-free