Expert: Tom Alonzo - 10/12/2009

Question
Recently I noticed that 5 of the 6 cordylines on our deck have a sort of discoloration, i.e.,the deep burgundy has turned into almost a yellow opaque. This applies to the top uppermost foliage. The lower part of the plants still have colour and so too does the new growth at top centre.All plants face east, so here in Australia they get the early morning sun thru to 3/4pm.The 1 that is unaffected is more shaded.CAN YOU HELP?

Answer
Hi Anthony,
Thanx for your help.  Cordylines generally prefer full sun but will also grow in partial shade.  The discoloration could be from a number of causes.  Make sure the pots they are in drain fully.  Soggy soil can cause yellowing at the tips of many plants.  Unfortunately, a lack of water can cause this also, especially if it has been particularly warm.  Are you entering spring now, down there?  The other main reason for yellowing can be either too much or not enough nutrients.  In my experience, too much nitrogen can cause tip burn or yellowing.  If the plants have been sitting in the same pot for a long time with no added nutrients, that could be the cause.  Did I confuse you enough?  ;o)  Seriously, check watering and fertilizing.  Those would be the two main causes.  I hope this helps.
Tom