How to Prune heath pearlwort?
No pruning required, but may be trimmed back from paving to keep edges neat

heath pearlwort · Sagina subulata
Also known as: lawn pearlwort; lawn spurrey
Grow in moderately fertile, acid to neutral soil, in full sun with some midday shade. Dislikes intense heat, drought and waterlogging. May become leggy in too much shade. Tolerates light foot traffic, good for gaps in paving as well as rock gardens, troughs and small, low-use lawns
No pruning required, but may be trimmed back from paving to keep edges neat