Lilly Pilly ( Syzygium or Acmena spp . ) is an Australian native that grows courteously in small thousand , take up minimal space yet provide both good looks and ghost . Only 10 to 25 feet tall with an erect or slimly weep canopy , Lilly Pilly ’s branches rarely step in with overhead stock . Roots position only a moderate risk of exposure to underground utility when decent space , according to the Urban Forest Ecosystems Institute site . An evergreen plant , Lilly Pilly grow good in U.S. Department of Agriculture plant hardiness zones 9 through 11 , depend on species , and require full sunshine and moist grime . A substantial , in general gentle - care Sir Herbert Beerbohm Tree , lilly pilly can suffer from phytophthora disease , root rot and rust .

Phytophthora Disease

If the lilly pilly ’s foliage appears to droop when warm weather come , or appear water emphasise , turns colour or develops a broadly dull visual aspect , the tree may be put up from Phytophthora pennant and root rot . too wet land around the roots can foster growth of this soil - borne pathogen , which can eventually wipe out young trees . gloomy area may develop around the foundation of the trunk , and if you cut away a small part of bark in this area , ruby - brown areas of disease may be clearly seen .

Root Rots

Often , when the origin of tree begin to rot , it is because of too much water . Poor drainage , overwatering or excessive rainfall can all cause moisture to enfold the roots for too long , do them to swell as they take in more urine than they can effectively handle . Oedema occur when the tree ’s circulatory system sends excess piddle to the foliage . This causes pocket-sized , blisterlike eruptions on the underside of the lilly pilly ’s leaves that eventually bristle , leaving spots of beat cells that may be white to dark-brown and corklike . The leaves may finally yellow and fall off . Overwatering and poor drainage can be a mortal combination in the yard . Although lilly pilly grows best in moist territory , the soil should be well - drained and not ride out systematically wet . Roots suffocate and die , and the tree diagram ’s growth may be stunt and the foliage may yellow , or the tree may formulate oedema .

Myrtle Rust

Myrtle rust , also known as Psidium guajava rust , is do by the pathogen Puccinia psidii . This incursive disease first appear in Florida in 1977 , and is tardily spread out outward . Myrtle rust favor plants in the Myrtacaea folk like Syzygium , causing distorted maturation with clusters of bright lily-livered to rust fungus - colored pustules . The disease can attack flowers and yield as well as leaves , and may cause flower to flunk , which means the tree will not grow yield . Twig dieback can also happen . Cool temperature and gamy humidness help Vinca minor rust outlast , but once the lilly pilly ’s new leafage survive for at least 40 days , they formulate potent resistance to the disease .

Prevention

Controlling soil moisture around the lilly pilly tree diagram help prevent Phytophthora and other root problem . Maintaining Sir Herbert Beerbohm Tree health help the tree withstand and recover from problems because of insects . Because thrip not only fly but also swim around on the breeze until they feel a host , bar is airy . amend drain , if require , and re - evaluate supplementary watering practices to keep off keeping the soil around the lilly pilly too wet . A moisture meter can tell you if the tree needs watering . Except in very dry status or drought , lilly pilly broadly speaking does well with watering once per week .

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