Too far away.

Temperate climate deciduous trees have dormancy requirements, to grow these in the tropics you must be in a location that experiences the minimum number of chilling hours for the particular kind of tree. With many orchard fruit tree cultivars these hours are actually known and listed by nursery catalogs and other sources; I don't remember seeing these reported for any ornamental trees.

bboy - I reckon those are natural woods in the background rather than ornamentals. I googled the image and it's in Transylvania, ie a sub Alpine climate with very cold winters.