By Jonsea
United States 
Hi, I live in Southern Spain,and four years ago planted three Oleander,shrubs about 1.5 metres back from a long hedge,in that area the old hedge seems to be dying off,with oleander suckers near it,the rest of the hedge is fine,please can you advise. John.
3 Apr, 2012
Most likely cause is just the extra competition for water and nutrients from the oleander - although they are toxic plants, they do not, as far as I can establish, have any allellopathic effect on surrounding plants.
3 Apr, 2012