I wrote recently about watering during an extended hot spell, and while working today I was…
Drought tolerant. Deadhead flowering spikes to prolong flowering.
You can propagate by seed in autumn or spring or by softwood or semi-ripe cuttings of non-flowering shoots in mid-summer. Propagate cultivars by cuttings.
Pests, diseases or disorders
Leaf and bud eelworms, powdery mildew. Plants naturally decline and need replacing every 3-5 years.