There are severe constraints on the supply side of the provision of infrastructure in Asia. The infrastructure financing gap between what is invested in Asia-Pacific (around US$48 billion) and what is needed (US$228 billion) is around US$180 billion every year.
Placed in the centre of a garden bed, they can be underplanted with low growing shrubs and bulbous plants for an harmonious effect; or underplanted with grass for a contrasting statement. Alternatively, the tree can be situated at the end of a long garden to draw visitors out into the garden.
Some citrus plants such as the sour orange tree can be grown from the seed and the sour orange root system offers dwarf qualities, cold resistance, and resistance of the roots to nematodes, fungi, and bacteria. Kumquats cannot be reproduced commercially by nurseries from the seed, because of the root problems.