How do you grow and care for Lilly Pillies?
not much more to add! leaves aren't browning off at all. the species was, i think, gracillis? australis? the leaves are solid green, lighter when new, darkening slightly with age (no pink or red tips).
These plants have suffered from lack of water and/or heat stress at some stage. A soil wetter may help penetration into the soil but it sounds like the surrounding soil is so dry that your 3 litres hasn't been enough. If there is new growth coming then they should be ok now, some seaweed tonic will help.
Answered: 2 Dec, 2018