Site Concerns
Wind and cold can lead to leaf scorch, which causes the ends of the leaves to dry, turn brown and die back. Wind desiccates the leaves, causing any moisture to evaporate more quickly. Although most bottle brushes are drought-tolerant and scorch won't kill the shrub, planting in an area with wind protection can keep the plant both attractive and healthy. Bottle brushes also suffer damage if temperatures drop below 20 degrees Fahrenheit, so even in mild climates a frost can cause some leaf damage. Prune off damaged stems back to the nearest unaffected wood. Wipe the shears with rubbing alcohol before pruning and after each cut.
Water Stress
Bottle brushes are extremely drought-tolerant, with one notable exception. Weeping bottle brush (Callistemon viminalis), which grows in USDA zones 9 through 11, requires regular watering to remain healthy. Brown,

and crumbly leaf edges indicate drought stress. Water weeping bottle brush once weekly during

weather so the top 8 to 12 inches of soil remain moderately moist. Some bottle brush varieties don't require watering in climates that get regular rain and they may suffer from root rot, stem dieback or leaf drop if they get too much water or if the soil doesn't drain well and becomes soggy.
Vetar i hladnoca mogu prouzrokovati ''opekotinе'na listu koje rezultuju susenjem lista, braon krajevima i na kraju odumiranjem. Vetar i promaja uzrokuju brze isparavanje. Iako su vecina
calistemon otporne na susu a jako sunce nece ubiti biljku sadnja u prostoru koji je zasticen od vetra i promaje pomaze da biljka izgleda zdravo i dobro.
Calistemon takodje mogu ostetetiti temperature nize od -5 tako da i u merenim klimatskim uslovima mraz moze da uzrokuje ostecenje na listovima. Orezati ostecene stabljike do najblizeg zdravog dela biljke. Makaze dezinfikovati alkoholom pre orezivanja i izmedju svakog reza.
Calistemon su veoma otporne na susne uslove sa jednim izuzetkom. Callistemon viminalis, koja raste u amerckim klimatskom zonama 9-11, zahteva redovno zalivanje. Braon, suvi i krhki listovi znak su manjka vode. Biljku zalivati jednom nedeljno u kada je susno vreme tako da povrsinskih 20-30 cm ostanu umereno vlazni. Neke sorte ne zahtevaju redovno zalivanje ako kisa pada redovno. Ako je zemljiste u duzem periodu natopljeno vodom koren moze da istruli, stabljike da odumru ili da im opadne lisce.
Ako sam dobro razumeo sve ovo sto je ovde napisano. Ta biljka je dosta otporna na susne uslove ali najbolje je zemljiste odravati umereno vlazim. Otprilike zalivati kada se gornjih 1-2 cm osuse. Ono sto biljci najvise smeta su vetar i promaja.