El Greco ? El Greco is an attractive tree even if just grown for its silvery green foliage. It has a compact mature size of just 3mx3m, making it the perfect-sized tree for a smaller urban section. El Greco are self-fertile but are not known to fruit easily in New Zealand. This may be to your advantage as you don’t end up with lots of very hard olive stones flying around when you mow under your tree. Good oil content.