Laserpitium siler, common name laserwort, is a herbaceous perennial plant of the family Apiaceae. Laserpitium siler (Laserwort) will reach a height of 1m and a spread of 1m after 1-2 years. Suggested uses. Add to salads, Beds and borders, Cottage/Informal, Flavouring food and drinks, Gravel, Rock, Underplanting, Woodland. Cultivation. Plant in well-drained soil, in full sun or partial shade but will tolerate a wide range of conditions.