How to Prune Sisyrinchium macrocarpum?
No pruning required

Sisyrinchium macrocarpum · Sisyrinchium macrocarpum
Grow in poor to moderately fertile, well-drained, neutral to slightly alkaline soil in full sun. Protect from excessive winter wet. Suitable for an alpine trough or gravel garden. May have the potential to become a nuisance as seeds prolifically
No pruning required