If you are planting Chinese elms, you should be aware that they can grow to be very large; start shedding seedpods in early autumn, followed by seeds and then leaves. This goes on until late spring. The leaves are copious and do not rot down easily.
Their sap rains down during autumn, making any paving nearby extremely sticky.
They propagate very easily, resulting in enormous crops of seedlings in weed like proportions.
They also provide wonderful shade during the hot weather of summer, but native parrots and cockatoos enjoy the sap and continually pluck off small shoots.